85) ANSWER

C) Enuresis

RATIONALE

Childhood disorders that appear to be genetically transmitted include enuresis, autism, mental retardation, some language disorders, Tourette's syndrome, and attention-deficit hyperactivity disorder (ADHD). Of these, autism is the more pervasive disorder. Anxiety (option 1), sleepwalking (option 2), and oppositional defiance disorder (option 4) do not appear to be genetically transmitted. Notice that autism is a more pervasive problem than the other three options. Recall statistics about childhood mental health disorders to make a selection.