Prevalence of schizophrenia in dizygotic twins of schizophrenic patient is: (A) 40%, (B) 1%, (C) 12%, (D) 0.10%
Answer is C. Usual prevalence in general population is 0.5 to 1% and 40% in child with both parents being schizophrenic. Among dizygotic twins, it is 12% if a parent is schizophrenic Ref: Essentials of postgraduate psychiatry By JN Vyas 1st ed Pg 386