Carol and Zack have a son, Ian. Tenisha and Bill have a son, Martin. As a child, Zack had ADHD. What is the relative risk of developing ADHD for Ian and Martin?

A. Martin has one-half the risk that Ian has.
B. Ian and Martin have roughly the same risk.
C. Ian has a five times higher risk than Martin.
D. Ian's risk is three times higher than Martin's.


Answer: C

Psychology

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