If John has schizophrenia, how likely is it that his dizygotic twin brother will also have schizophrenia?
A. John's brother will also have schizophrenia.
B. There is a 38% probability that John's brother will have schizophrenia.
C. There is an 18% probability that John's brother will have schizophrenia.
D. John's brother will not have schizophrenia.
Answer: C
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