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

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12 Dec 2004, 22:11
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Brain scans of people exposed to certain neurotoxins reveal brain damage identical to that found in people suffering from Parkinsonâ€™s disease. This fact shows not only that these neurotoxins cause this type of brain damage, but also that the brain damage itself causes Parkinsonâ€™s disease. Thus brain scans can be used to determine who is likely to develop Parkinsonâ€™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 Parkinsonâ€™s disease are less accurate than brain scans.
(B) It overestimates the importance of early diagnosis in determining appropriate treatments for people suffering from Parkinsonâ€™s disease.
(C) It mistakes a correlation between the type of brain damage described and Parkinsonâ€™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 Parkinsonâ€™s disease.
(E) It neglects to specify how the information provided by brain scans could be used either in treating Parkinsonâ€™s disease or in monitoring the progression of the disease.
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12 Dec 2004, 22:26
i'll go with answer choice (C):

there is nothing in the argument suggesting that these neurotoxins cause parkinsons. just because the brain damage cause by the toxins is the same as in parkinsons , that doesnt mean that these toxins cause parkinsons. there can be another cause. therefore answer - C.
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13 Dec 2004, 01:13
I think the choice C is obvious.

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Saurabh Malpani
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13 Dec 2004, 07:04
i was thinking about A as well, but i am sticking with my original answer - C. What is the OA???
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13 Dec 2004, 08:16
I also picked C, but C is not the OA provided.
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13 Dec 2004, 08:44
if C is not the correct answer, than it must be A. post the OA and explain.
13 Dec 2004, 08:44
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