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Chronic fatigue syndrome, a condition that afflicts

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Chronic fatigue syndrome, a condition that afflicts [#permalink] New post 02 Dec 2011, 06:42
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Question Stats:

61% (02:41) correct 39% (01:51) wrong based on 107 sessions
Chronic fatigue syndrome, a condition that afflicts thousands of people, is invariably associated with lower-than-normal concentrations of magnesium in the blood. Further, malabsorption of magnesium from the digestive tract to the blood is also often associated with some types of fatigue. These facts in themselves demonstrate that treatments that raise the concentration of magnesium in the blood would provide an effective cure for the fatigue involved in the syndrome.

The argument is most vulnerable to which one of the following criticisms?

(A) It fails to establish that lower-than-normal concentrations of magnesium in the blood are invariably due to malabsorption of magnesium.

(B) It offers no evidence that fatigue itself does not induct lowered concentrations of magnesium in the blood.

(C) It ignores the possibility that even in people who are not afflicted with chronic fatigue. Syndrome concentration of magnesium in the blood fluctuates.

(D) It neglects to state the exact concentration of magnesium in the blood which is considered the normal concentration.

(E) It does not specify what methods would be most effective in raising the concentration of magnesium in the blood.

[Reveal] Spoiler:
B


Can someone please explain the logic behind the OA?

Thanks
[Reveal] Spoiler: OA
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Re: LSAT Weaken question [#permalink] New post 02 Dec 2011, 06:47
I got it right after I posted the question:

The author claims that since the level of magnesium in blood and stress are correlated, increasing the level of magnesium will alleviate the stress. However, the fact that two things a correlated doesn't necessarily imply that one thing causes the other. For all we know, stress might be the cause of low level of magnesium and increasing the level will not help to reduce the stress (since the level of magnesium in blood doesn't cause stress).
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Re: LSAT Weaken question [#permalink] New post 02 Dec 2011, 14:04
B____> one of the ways used to weaken an argument is to show that the cause and effect relationship is actually not clear!
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Re: LSAT Weaken question [#permalink] New post 02 Dec 2011, 19:11
The premise is that Fatigue => Lower-than-normal concentrations of magnesium

Choice B reverse the cause - effect. So, it is correct.
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Re: Chronic fatigue syndrome, a condition that afflicts [#permalink] New post 16 Jun 2014, 11:42
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Re: Chronic fatigue syndrome, a condition that afflicts   [#permalink] 16 Jun 2014, 11:42
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