Studies of the concordance rates for depressive disorder and bipolar mood disorder in monozygotic (MZ) and dizygotic (DZ) twins suggest
a. a larger role of genetic factors in bipolar mood disorder.
b. a larger role of genetic factors in depressive disorder.
c. similar concordance rates for bipolar mood disorder in MZ and DZ twins.
d. similar concordance rates for depressive disorder in MZ and DZ twins.
Answer: a.
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