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A certain medication used to treat migraine headaches acts b

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A certain medication used to treat migraine headaches acts b [#permalink] New post 31 Oct 2017, 14:09
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A certain medication used to treat migraine headaches acts by blocking pain receptors in the brain. When a person takes the medication within one hour after ingesting grapefruit or grapefruit juice, however, the effectiveness of the medication is significantly diminished. Researchers have determined that the grapefruit contains a compound that alters the shape of the pain receptors, with the result that the medication can no longer bind with them completely.

Which of the following conclusions could be most properly drawn from the information given above?

(A) If one takes the medication more than an hour after ingesting grapefruit, its effectiveness is not diminished.
(B) Ingesting grapefruit after taking the medication does not diminish the effectiveness of the medication.
(C) There is only one type of pain receptor in the brain.
(D) The medication is fully effective only when it properly binds with its target pain receptors.
(E) It is not possible to design a medication for migraine headaches that can bond with the altered receptors.
[Reveal] Spoiler: OA

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Last edited by Carcass on 21 Oct 2018, 00:38, edited 1 time in total.
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Re: A certain medication used to treat migraine headaches acts b [#permalink] New post 08 Jan 2018, 20:11
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is the ans D?
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Re: A certain medication used to treat migraine headaches acts b [#permalink] New post 09 Jan 2018, 08:39
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Explanation

Quote:
The passage says that the medication has been shown to be less effective when taken after grapefruit consumption because grapefruit consumption has been shown to affect the binding of the medication to pain receptors. It can be concluded that effective binding is needed to enable the full effectiveness of the medication, which is what (D) states. Regarding (A), the passage says that grapefruit or grapefruit juice ingested within an hour will “significantly” diminish the effectiveness of the medication. This does not mean that grapefruit or grapefruit juice ingested more than an hour before the medication is ingested will have no effect on the medication; it may have a mild effect. Regarding (B), the passage speaks only of taking the medication after ingesting grapefruit; it says nothing about what might happen when eating grapefruit after taking the medication. As for (C), the passage implies that the pain receptors that the specific medication works on are the pain receptors that are affected by grapefruit. This does not mean that these are the only pain receptors in the brain. (E) is out of scope. You are given no information about possible research or design of new migraine medications.

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Re: A certain medication used to treat migraine headaches acts b [#permalink] New post 18 Oct 2018, 17:21
I could not pick between B and D. Please explain.
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Re: A certain medication used to treat migraine headaches acts b [#permalink] New post 19 Oct 2018, 19:31
D is the answer
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Re: A certain medication used to treat migraine headaches acts b [#permalink] New post 20 Oct 2018, 10:55
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jarabhuiyan wrote:
I could not pick between B and D. Please explain.



Please, refer to the explanation above.

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Re: A certain medication used to treat migraine headaches acts b [#permalink] New post 21 Oct 2018, 00:30
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Only D is visible in the timer....
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Re: A certain medication used to treat migraine headaches acts b [#permalink] New post 21 Oct 2018, 00:38
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Fixed. Thank you
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Re: A certain medication used to treat migraine headaches acts b   [#permalink] 21 Oct 2018, 00:38
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