What do studies of concordance rates for schizophrenia in monozygotic (MZ) and dizygotic (DZ) twins show?
a. almost 100 percent concordance in MZ twins, 0 percent in DZ
b. very low rates of concordance in either type of twin
c. consistent evidence of higher concordance in DZ than MZ
d. consistent evidence of higher concordance in MZ than DZ
Answer: d.
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