单选题 Two middle-aged sisters have been diagnosed with Huntington's disease. The children of these clients want to know what their chances are of developing this genetic disorder. The nurse's best response would be.

A、 "Only women become symptomatic. "
B、 "This disorder is an autosomal dominant disorder, so each child has a 50% chance of inheriting it. "
C、 "This disorder is an autosomal recessive disorder, so each child has a 25% chance of inheriting it. "
D、 "Women are symptomatic and men are carriers of this disorder. "

【正确答案】 B

【答案解析】Huntington's disease is an autosomal dominant disorder; therefore, each child has a 50% chance of inheriting it. Men and women are equally affected.