LSAT 112 | Section 4 | Logical Reasoning: Q4

LR Question 4 Explanation

QUESTION TEXT: A certain gene can be stimulated by chemicals in cigarette smoke…

QUESTION TYPE: Must be True

FACTS:

1. Chemicals in cigarette smoke can stimulate a certain gene.
2. Lung cells will then metabolize the chemical in a way that makes the cells cancerous.
3. Smokers who do not experience stimulation in this gene still have as high a risk of developing lung cancer.

ANALYSIS: There must be at least one other way that smoking can cause lung cancer.

___________

1. CORRECT. There must be at least one other risk factor. 
2. We don’t know anything about non-smokers.
3. Actually we’re told that the risk is the same for both groups. 
4. We have no idea what other chemicals might also stimulate the gene.
5. Same as C. We’re told that the risk is the same for both groups.