A newly discovered disease is thought to be caused by a : GMAT Critical Reasoning (CR)
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A newly discovered disease is thought to be caused by a

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A newly discovered disease is thought to be caused by a [#permalink]

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New post 18 Jan 2012, 10:09
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A newly discovered disease is thought to be caused by a certain bacterium. However, recently released data notes that the bacterium thrives in the presence of a certain virus, implying that it is actually the virus that causes the new disease.

Which of the following pieces of evidence would most support the data’s implication?

(A) In the absence of the virus, the disease has been observed to follow infection by the bacterium.
(B) The virus has been shown to aid the growth of bacterium, a process which often leads to the onset of the disease.
(C) The virus alone has been observed in many cases of the disease.
(D) In cases where the disease does not develop, infection by the bacterium is usually preceded by infection by the virus.
(E) Onset of the disease usually follows infection by both the virus and the bacterium.

[Reveal] Spoiler:
question: according to CR bible, to support a causal argument, u need to
1- eliminate possible causes
2- show when A happens, B happens
3- when A doesnt happen, B doesn't happen
4- show that the relationship is not reversed
5--6--7 etc.
in this case I chose B, which confirmed that A caused B, when A happens B happens. I am not sure why its wrong. I am so upset :evil:
[Reveal] Spoiler: OA

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Re: A newly discovered disease is thought [#permalink]

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New post 18 Jan 2012, 13:25
The conclusion as given in the last statement is - Virus causes the disease and not the bacterium.
Option C supports this conclusion by highlighting that in many cases, even in the absence of the bacteria, the disease can be caused only by the virus.

This is not a Causal argument. Infact the conclusion negates the cause and anything that harms the causal relationship will strengthen the overall argument.
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Re: A newly discovered disease is thought [#permalink]

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New post 18 Jan 2012, 14:32
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This is a tricky question - it is LSAT after all.

Let's take a look at (B). It says that the virus causes the bacteria to grow, a process followed by the onset of the disease. So this is not a simple cae of A causes B. Instead A (the virus) causes B (the bacteria) and then C (the disease) is observed.

We want an answer choice in which only A (the virus) appears with B (the disease).

(C) states that the virus alone has been observed by the disease. Without the presence of the bacterium confounding the causal chain, (C) provides the strongest support that the virus causes the disease.

Hope that helps :)
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Re: A newly discovered disease is thought [#permalink]

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New post 18 Jan 2012, 23:39
+ 1 C.
C is clearly supporting the conclusion.
B and the sentence "recently released data notes that the bacterium thrives in the presence of a certain virus" are same , thus B is merely reinstating the premise...
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Re: A newly discovered disease is thought [#permalink]

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New post 23 Mar 2012, 22:03
it is clear from ChrisLele explanation.
answer is C.
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Re: A newly discovered disease is thought to be caused by a [#permalink]

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New post 25 May 2016, 04:44
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).

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Re: A newly discovered disease is thought to be caused by a   [#permalink] 25 May 2016, 04:44
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