Which of the Following Is FALSE About Down's Syndrome

Multiple Choice

Which of the following is FALSE about Down's syndrome?

A) Many people with mild mental retardation have Down's syndrome.
B) Down's syndrome occurs in fewer than one in every 1,000 births.
C) The chances of having a Down's syndrome child increase among women who are over 35 when they become pregnant.
D) Down's syndrome is caused by a problem in the twenty-first pair of chromosomes.