Below Are Concordance Rates for Five Different Human Disorders Studied

Multiple Choice

Below are concordance rates for five different human disorders studied in monozygotic (MZ) and dizygotic (DZ) twins. $$\begin{array} { c l c } \hline & { \text { Concordance } } \\\text { Disorder } & \text { MZ } & \text { DZ } \\& & \\\hline \text { A } & 100 \% & 50 \% \\\text { B } & 17 \% & 16 \% \\\text { C } & 56 \% & 11 \% \\\text { D } & 100 \% & 25 \% \\\text { E } & 50 \% & 100 \%\end{array}$$ One of the above disorders is in part caused by significant genetic effects. In addition to a significant genetic contribution toward the disorder, there are also significant environmental effects that contribute toward the disorder phenotype. To which of the above disorders would this description MOST likely apply?

A) A
B) B
C) C
D) D
E) E