Brain scans of people exposed to certain neurotoxins reveal : GMAT Critical Reasoning (CR)
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# Brain scans of people exposed to certain neurotoxins reveal

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Director
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Brain scans of people exposed to certain neurotoxins reveal [#permalink]

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18 Apr 2008, 09:30
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Brain scans of people exposed to certain neurotoxins reveal brain damage identical to that found in people suffering from Parkinson’s disease. This fact shows not only that these neurotoxins cause this type of brain damage, but also that the brain damage itself causes Parkinson’s disease. Thus brain scans can be used to determine who is likely to develop Parkinson’s disease.
The argument contains which one of the following reasoning errors?
(A) It fails to establish that other methods that can be used to diagnose Parkinson’s disease are less accurate than brain scans.
(B) It overestimates the importance of early diagnosis in determining appropriate treatments for people suffering from Parkinson’s disease.
(C) It mistakes a correlation between the type of brain damage described and Parkinson’s disease for a causal relation between the two.
(D) It assumes that people would want to know as early as possible whether they were likely to develop Parkinson’s disease.
(E) It neglects to specify how the information provided by brain scans could be used either in treating Parkinson’s disease or in monitoring the progression of the disease.
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18 Apr 2008, 13:17
C, only because all the other answer choices do not sound like GMAT answers.
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18 Apr 2008, 18:28
Clearly C -
saravalli wrote:
Brain scans of people exposed to certain neurotoxins reveal brain damage identical to that found in people suffering from Parkinson’s disease. This fact shows not only that these neurotoxins cause this type of brain damage, but also that the brain damage itself causes Parkinson’s disease. Thus brain scans can be used to determine who is likely to develop Parkinson’s disease.
The argument contains which one of the following reasoning errors?
(A) It fails to establish that other methods that can be used to diagnose Parkinson’s disease are less accurate than brain scans.
(B) It overestimates the importance of early diagnosis in determining appropriate treatments for people suffering from Parkinson’s disease.
(C) It mistakes a correlation between the type of brain damage described and Parkinson’s disease for a causal relation between the two.
(D) It assumes that people would want to know as early as possible whether they were likely to develop Parkinson’s disease.
(E) It neglects to specify how the information provided by brain scans could be used either in treating Parkinson’s disease or in monitoring the progression of the disease.
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22 Apr 2008, 12:32
guys OA is given as B in CR1000 doc.
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22 Apr 2008, 22:38
Yea but I'd appeal to common sense and say that the OA in this case may be incorrect. What do other clubbers think here ?
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23 Apr 2008, 01:01
It is a clear C guys.

I don't see B even as a contender.
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23 Apr 2008, 04:07
Same here, C is a clear winner!! Maybe the gurus can help with more explanations!!
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23 Apr 2008, 09:21
I agree with C

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23 Apr 2008, 09:41
kyatin, thanks for the confidence.

I agree with all of you folks here. C is definitely the right answer.

The argument says that people affected by neurotoxins have the same type of brain damage suffered by people with parkinsons disease. In other words, 2 isolated events (neurotoxins and parkinsons disease) are assumed to be cause and effect mainly because of a common sympton(correlation), in this case brain damage. What if there are people with this type of brain damage who dont have parkinsons? So, there is some room that this conclusion could be false.

In other words,

All parkinsons -> Brain Damage

but, we dont know that

All brain damamge -> Parkinsons

The argument therefore assumes a correlation for a cause and effect. Thus, the answer is C. I would ignore the answer OA B.
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23 Apr 2008, 09:52

Thanks as always.

I think we all shoudd create one sticky to list all disputed answers from 1000CR,SC etc..unless its already there.
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24 May 2010, 13:28
Im also with C.
B talks about treatments and that´s out of scope, dont u think?
Could any CR guru clarify?
Thanks.
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26 May 2010, 11:46
It is a straight C.
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27 May 2010, 00:33
Yes, the answer must be C:

A general note on weakening questions:

Weakening questions must weaken the conclusion, which, in this case, is that scans can determine the likelihood of developing Parkinson's... The correct answer affects the truth of this sentence and only this sentence. Thus, what people want, whether other scans work, treatment options etc. are irrelevant to the conclusion.
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27 May 2010, 10:37
C it is!!

i agree with all the reasoning given above
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28 May 2010, 12:14
Can a moderator merge this thread with this one?

cr-brain-scans-62193.html#p730917
Re: CR-neurotoxins   [#permalink] 28 May 2010, 12:14
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