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# CR Question - Marijuana!

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09 Mar 2007, 14:43
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I'm baffled as to why the OA IS the answer.

4. An ingredient in marijuana known as THC has been
found to inactivate herpesviruses in experiments. In
previous experiments researchers found that inactivated
herpesviruses can convert healthy cells into cancer cells.
It can be concluded that the use of marijuana can cause
cancer.
Which one of the following, if true, most seriously
weakens the argument?

(A) Several teams of scientists performed the various
experiments and all of the teams had similar
results.

(B) The carcinogenic effect of THC could be
neutralized by the other ingredients found in
marijuana.

(C) When THC kills herpesviruses it weakens the
immune system, and it might thus diminish the
bodyâ€™s ability to fight other viruses, including

(D) If chemists modify the structure of THC, THC
can be safely incorporated into medications to
prevent herpes.

(E) To lessen the undesirable side effects of
chemotherapy, the use of marijuana has been
recommended for cancer patients who are free of
the herpesvirus.
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Manager
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09 Mar 2007, 15:27
(C).

THC kills herpesviruses it weakens the immune system. It is not a direct cause of cancer.
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09 Mar 2007, 16:07
B. If the carcinogenic effect is neutralized then isnt the argument is weakened.
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09 Mar 2007, 21:40
B and C come close. But I choose B over C.

C says that "THC kills herpesviruses" whereas the argument says "THC has been found to inactivate herpesviruses" . Hence C goes against what is stated in argument.

B - "The carcinogenic effect of THC could be neutralized by the other ingredients found in marijuana. " - explains why use of marijuana may arrest cancer - thus weakens the argument.
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10 Mar 2007, 05:00
GMAThopeful wrote:
B and C come close. But I choose B over C.

C says that "THC kills herpesviruses" whereas the argument says "THC has been found to inactivate herpesviruses" . Hence C goes against what is stated in argument.

B - "The carcinogenic effect of THC could be neutralized by the other ingredients found in marijuana. " - explains why use of marijuana may arrest cancer - thus weakens the argument.

Thanks. (B) makes more sense.
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10 Mar 2007, 07:16
Evidence: An ingredient in marijuana known as THC has been
found to inactivate herpesviruses in experiments. In
previous experiments researchers found that inactivated
herpesviruses can convert healthy cells into cancer cells.

Conclusion: That the use of marijuana can cause cancer.

Argument says "inactivated herpesviruses can convert healthy cells into cancer cells". So there is no dispute about THC causing the damage. It is carcenogenic. C just explains the process through which that damage is possible.

C is to an extent strengthening the conclusion. B is weakening the conclusion and is the answer.
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10 Mar 2007, 11:09
The assumtion here is that THC is the only cause of cancer and it inactivates hyperviruses. But if the effect of THC is neutalize by other ingradients found in marijuana then the argument that THC causes cancer becomes invalid so my answere is B)

A) does'nt help much
C) supports the argument
D) is out of scope
E) is irrelavent to the question

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10 Mar 2007, 11:55
OA is B. Originally I picked C. Thanks for all the explanations.
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Re: CR Question - Marijuana! [#permalink]

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10 May 2011, 02:08
C rather strengthens the conclusion that THC is instrumental in causing Cancer.

B wins over it.
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Re: CR Question - Marijuana! [#permalink]

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26 Jul 2012, 20:50
Can someone tell why E is incorrect. I came close to B & E .
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Re: CR Question - Marijuana! [#permalink]

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27 Jul 2012, 10:56
I think E is irrelevant as it discuss about reduction in undesirable effects of chemotherapy. Its away from the causality.
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Re: CR Question - Marijuana!   [#permalink] 27 Jul 2012, 10:56
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