If We Say That Bipolar Disorder Has a Concordance Rate

Multiple Choice

 If we say that bipolar disorder has a concordance rate of 85 percent in monozygotic twins, we mean that

A) 85 percent of the time bipolar disorder is the result of genetic influences shared by monozygotic twins.
B) if one monozygotic (identical) twin has bipolar disorder, his or her twin has an 85 percent chance of being diagnosed with the disorder as well.
C) 85 percent of the time, bipolar disorder cannot be explained by genetic variables, even in monozygotic twins.
D) a parent with bipolar disorder has an 85 percent chance of passing the disorder to his or her monozygotic twins.