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An ingredient in marijuana known as THC has been found to inactivate

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An ingredient in marijuana known as THC has been found to inactivate  [#permalink]

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New post 15 Jan 2019, 00:30
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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 body's ability to fight other viruses, including viruses linked to cancers.

(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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An ingredient in marijuana known as THC has been found to inactivate  [#permalink]

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New post Updated on: 16 Jan 2019, 01:47
Bunuel wrote:
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 body's ability to fight other viruses, including viruses linked to cancers.

(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.


Out of given options b stands out as it gives an counter argument and provides a fact which weakens the conclusion : It can be concluded that the use of marijuana can cause cancer.
cause and effect type weakener .

IMO B

Originally posted by Archit3110 on 15 Jan 2019, 06:50.
Last edited by Archit3110 on 16 Jan 2019, 01:47, edited 3 times in total.
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An ingredient in marijuana known as THC has been found to inactivate  [#permalink]

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New post 15 Jan 2019, 10:37
Archit3110 wrote:
Bunuel wrote:
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 body's ability to fight other viruses, including viruses linked to cancers.

(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.


Out of given options c stands out as it gives an counter argument and provides a fact which weakens the conclusion : It can be concluded that the use of marijuana can cause cancer.

IMO E

Archit3110
How is B not the correct weakener ? Here it is explicitly mentioned that the carcinogenic effect of THC is countered by other ingredients of marijuana and this implies that marijuana as a whole won't cause cancer because of "other ingredients". I might be wrong, can you please explain ?
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Re: An ingredient in marijuana known as THC has been found to inactivate  [#permalink]

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New post 15 Jan 2019, 11:13
E does not have any impact on the conclusion. B shows why marijuana will not cause causer even though an ingredient of marijuana can cause cancer. Hence B is correct.
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Re: An ingredient in marijuana known as THC has been found to inactivate  [#permalink]

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New post 15 Jan 2019, 12:05
I think the correct answer is B. We need to find an answer that weakens the conclusion 'marijuana causes cancer'.

(A) Several teams of scientists performed the various experiments and all of the teams had similar results. Strengthen. But several is how many? Various too.

(B) The carcinogenic effect of THC could be neutralized by the other ingredients found in marijuana. Correct. The fact that THC could be neutralized by other ingredients can weaken the conclusion that marijuana causes cancer.

(C) When THC kills herpesviruses it weakens the immune system, and it might thus diminish the body's ability to fight other viruses, including viruses linked to cancers. Strengthen.

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

(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. Marijuana is introduced to inactivate herpes viruses that can create cancerous cells. So with patients without herpesvirus, we are not sure how marijuana can act. So wrong too.
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Re: An ingredient in marijuana known as THC has been found to inactivate  [#permalink]

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New post 20 Jan 2019, 02:35
Although option b is right and i have marked b as correct answer .
Can anyone tell why option D is wrong.

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Re: An ingredient in marijuana known as THC has been found to inactivate  [#permalink]

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New post 20 Jan 2019, 02:46
Hi samguru68, Welcome to GMAT Club!

So the conclusion of the argument claims that (in a gist) "Cannabis is causing cancer" and we want to weaken this conclusion.

Option D talks about a futuristic possibility - "if scientists does something, we can prevent something..." This cannot be used an a strong weakener as it does nothing to the conclusion that has been made about existing cannabis causing cancer.

This is why a more direct option is B, which talks about other chemicals in cannabis that prevent cancer right NOW in the present.

Does this make sense?

samguru68 wrote:
Although option b is right and i have marked b as correct answer .
Can anyone tell why option D is wrong.

Posted from my mobile device

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Re: An ingredient in marijuana known as THC has been found to inactivate   [#permalink] 20 Jan 2019, 02:46
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