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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23 Apr 2010, 14:50
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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(prosper) 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.

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18 Nov 2010, 06:52
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poohv005 wrote:
A newly discovered disease is thought to be caused by a certain bacterium. However, recently released data notes that the bacterium thrives(prosper) 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.

Let's focus on the question first because that is all that is relevant to us. (In fact, it helps to read the question first so that you can read the argument with the question in perspective)
Which of the following pieces of evidence would most support the data’s implication?

Now, before we move on, what is data's implication?
implying that it is actually the virus that causes the new disease.

Now you have to pick an answer choice which best supports 'it is actually the virus that causes the disease'. Focus on that.

Option (C) clearly states that the virus alone has been found in many cases. Then it must be the virus that causes the disease.
It does not conflict with the premise above - 'A newly discovered disease is thought to be caused by a certain bacterium.' The premise does not say that it is caused by the bacterium. It only says that it is thought to be caused by the bacterium.

Option (B) doesn't strengthen that it is actually the virus that causes the disease. It says that the virus aids the growth of bacterium and this growth leads to development of the disease. The cause of the disease is still the bacterium. That is, if the bacterium weren't present, the virus probably couldn't do anything alone. (Note the probably here. This statement doesn't say that the virus alone cannot do anything but it also doesn't say that the virus alone can cause the disease) But we want to strengthen that it is actually the virus which is the cause.
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Get started with Veritas Prep GMAT On Demand for $199 Veritas Prep Reviews Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 7130 Location: Pune, India Followers: 2139 Kudos [?]: 13701 [1] , given: 222 Re: A newly discovered disease is thought to be caused by a [#permalink] ### Show Tags 17 May 2016, 01:39 1 This post received KUDOS Expert's post rohitt911 wrote: I marked B, because i thought it says the GROWTH of bacterium causes the disease and not only the bacterium. And the growth of bacterium is because of the virus, hence the virus causes the disease. What is data's implication? It is actually the virus that causes the new disease. Now you have to pick an answer choice which best supports 'it is actually the virus that causes the disease'. Focus on that. Option (B) doesn't strengthen that it is actually the virus that causes the disease. It says that the virus aids the growth of bacterium and this growth leads to development of the disease. The cause of the disease is still the bacterium. That is, if the bacterium weren't present, the virus probably couldn't do anything alone. (Note the probably here. This statement doesn't say that the virus alone cannot do anything but it also doesn't say that the virus alone can cause the disease) But we want to strengthen that it is actually the virus which is the cause. _________________ Karishma Veritas Prep | GMAT Instructor My Blog Get started with Veritas Prep GMAT On Demand for$199

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23 Apr 2010, 18:59
IMO it is B.
Premise: A newly discovered disease is thought to be caused by a certain bacterium
Premise: However, recently released data notes that the bacterium thrives(prosper) in the presence of a certain virus
Conclusion: implying that it is actually the virus that causes the new disease
We need to find the supportive evidence.

(A) In the absence of the virus, the disease has been observed to follow infection by the bacterium.
>> This is not supporting statement. It talks about after disease scenario.
(B) The virus has been shown to aid the growth of bacterium, a process which often leads to the onset of the disease.
>> Yes. This supports the conclusion.
(C) The virus alone has been observed in many cases of the disease.
>> This is conflicting. If this is correct then the first premise will go wrong.
(D) In cases where the disease does not develop, infection by the bacterium is usually preceded by infection by the virus.
>> This shows infection by bacteruim is preceded by infection by virus, but specifies in cases where disease does not develop. We should be looking for the disease cases.
(E) Onset of the disease usually follows infection by both the virus and the bacterium.
>> Talking about aftermath of disease. Not useful.
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08 Jul 2010, 04:27
I chose C since the conclusion says that the actual cause of the disease is virus.
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08 Jul 2010, 15:30
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09 Jul 2010, 11:01
poohv005 wrote:
A newly discovered disease is thought to be caused by a certain bacterium. However, recently released data notes that the bacterium thrives(prosper) 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.

IMO B is undermining the argument. If C is correct it strengthen's the argument that in majority of cases bacterium may not have any role to play in the disease. OA?
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09 Jul 2010, 19:10
C; We need to establish virus as the cause of the disease; there are two conflicting premises - and we are supposed to strengthen one (the data premise) over the other.
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10 Jul 2010, 00:08
C
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10 Jul 2010, 03:03
C is my take. We need to support Virus. Virus alone causes the disease along with promoting the bacteria.
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10 Jul 2010, 21:17
picked b ....but surely its c
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30 Sep 2010, 00:35
I think it's C, we need show that the only cause of the disease is the Virus not both
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02 Oct 2010, 22:42
My take is C

To strengthen the argument we have to show that virus is capable of causing the disease alone.
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02 Oct 2010, 23:39
I will go for B
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03 Oct 2010, 01:51
I feel its B. what's the OA?
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15 Nov 2010, 22:00
I vote for C too. What's the OA?
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16 Nov 2010, 01:11
It has to be C,
Any event which shows that
Virus is Present--> Disease is present & Bacteria is not present..
makes the presence of bacteria redundant
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16 Nov 2010, 06:14
B ...........boys

The argument: a new disease is discovered AND it is helped by the presence of certain virus, to the onset of the disease

B..............
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16 Nov 2010, 08:12
C) The virus alone has been observed in many cases of the disease.

This is the strongest among the choices.
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16 Nov 2010, 08:22
OA is C. I picked this by google search.

B is too much of a stretch/extreme
Re: CR strengthen question   [#permalink] 16 Nov 2010, 08:22

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