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

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GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5043
Location: Singapore
A newly discovered disease is thought to be caused by a [#permalink]

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15 Oct 2005, 13:16
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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 dataâ€™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.
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Joined: 21 Aug 2005
Posts: 789

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15 Oct 2005, 16:29
C

Choice C implies that in all the cases of the disease, it is either 'virus+bacteria" or just "virus". In any case, it is definitely Virus.
15 Oct 2005, 16:29
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