LSAT 105 | Section 2 | Logical Reasoning: Q4

LR Question 4 Explanation

QUESTION TEXT: An ingredient in marijuana known as THC has been found…

QUESTION TYPE: Weaken

CONCLUSION: Marijuana can cause cancer.

REASONING: In experiments, THC inactivated herpes. Other experiments found that inactivated herpes can make healthy cells cancerous.

ANALYSIS: We don’t know many details about these experiments. Were the cells human? Will THC affect herpes the same way when a human is infected with herpes?

___________

1. This would strengthen the argument by showing that the experiments were valid.
2. CORRECT. THC is dangerous on its own, but in marijuana there are other ingredients that remove the danger. (The conclusion was about marijuana.)
3. This increases the danger from THC. This information definitely doesn’t weaken the argument.
4. That’s nice. But in marijuana, the structure of THC isn’t modified. Presumably it’s still dangerous.
5. This has nothing to do with whether THC can cause cancer in patients who do have the herpes virus.

Recap: The question begins with “An ingredient in marijuana known as THC has been found”. It is a Weaken question. Learn more about LSAT Weaken questions in our guide to LSAT Logical Reasoning question types.