How is paternal age related to the incidence of schizophrenia?
A. Paternal age is unrelated to the likelihood of schizophrenia; younger maternal age, however, is a strong predictor.
B. Children of younger fathers are more likely to develop schizophrenia.
C. Children of younger fathers who were themselves children of older fathers are more likely to develop schizophrenia.
D. Children of older fathers are more likely to develop schizophrenia.
Answer: D
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