QUESTION TEXT: When several of a dermatologist's patients complained…
QUESTION TYPE: Strengthen – Exception
CONCLUSION: The dermatologist thinks that the rash was caused by telephones.
REASONING: The rashes were on the side of the face where the patients held their telephones.
ANALYSIS: It seems odd that telephones could cause rashes, since most people use telephones and don’t have rashes. The wrong answers all help show how some people could get rashes from phones.
The right answer just tells us that most people use telephones. We already knew that.
- Allergenic plastic could explain the rashes.
- This helps rule out the possibility that some other device caused the rashes.
- This shows that telephones were used for long enough to cause a rash.
- CORRECT. So? Most people don’t have rashes from telephones. This information doesn’t help us blame telephones for the patients’ rashes.
- This shows that the proposed cause (telephones) came before the proposed effect (rashes.)
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