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

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Manager
Joined: 17 Aug 2005
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A newly discovered disease is thought to be caused by a [#permalink]

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15 Sep 2005, 05:46
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A newly discovered disease is thought to be caused by a certain bacterium. However, recently released data note 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 bacteria, 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.

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Director
Joined: 14 Sep 2005
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Location: South Korea

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15 Sep 2005, 06:00
The passage implies that it is a certain virus, not a certain bacterium, that is thought to cause the new disease.

Thus, if (C) is true, we are more convinced that the virus causes the new disease.

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Manager
Joined: 15 Aug 2005
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15 Sep 2005, 06:23
C shud be it.

Krishna

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Manager
Joined: 31 Jul 2005
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15 Sep 2005, 06:51
why not B?

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Intern
Joined: 04 Feb 2005
Posts: 37

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15 Sep 2005, 07:01
Carloz wrote:
why not B?

Carloz, it is true that B also supports the implication, but we have to choose the best answer.

The author here wants to state that it is virus that causes the disease not bacteria. If there is an evidence where Virus alone is found with the disease, then it is the best evidence to support the implication.

so, C is the best answer.

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Senior Manager
Joined: 15 Aug 2005
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Location: Las Vegas, NV

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15 Sep 2005, 16:36
I think B actually weakens the author's claim. The author says that the virus NOT the bacteria causes the disease. So, if B were true it shows that the virus aids the GROWTH of bacteria and that growth leads to the disease.

I also chose C for the answer. All other answer weaken the argument.

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Director
Joined: 23 Jun 2005
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GMAT 1: 740 Q48 V42

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15 Sep 2005, 16:59
C! With my life science background, it jumped at me.

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Manager
Joined: 17 Aug 2005
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16 Sep 2005, 09:19
OA is C

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16 Sep 2005, 09:19
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