Which statement about attention deficit hyperactivity disorder (ADHD) is true?

Question

Quizplus · Accepted Answer

Genome-wide association studies (GWASs) provide substantial support that ADHD is a complex (multifactorial) disorder caused by the actions of many gene variants along with environmental contributions. GWASs have found regions on more than 10 chromosomes that are associated with ADHD in some people. The disorder is much more prevalent among males and is not dependent on which parent may also have had the problem. More sleep does not ameliorate the problem. Although many adults who had ADHD as a child have fewer symptoms in adulthood, about 2% to 4% retain most symptoms into adulthood.

Which Statement About Attention Deficit Hyperactivity Disorder (ADHD) Is True