If John has schizophrenia, how likely is it that his monozygotic twin brother will also have schizophrenia?
a. John's brother will also have schizophrenia.
b. There is an 80% probability that John's brother will have schizophrenia.
c. There is a 50% probability that John's brother will have schizophrenia.
d. John's brother will not have schizophrenia.
C. The concordance rate for schizophrenia among monozygotic, or identical, twins is 50%.
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Indicate whether the statement is true or false