One Parent Is Heterozygous for a Certain Known Disease and Is

Multiple Choice

One parent is heterozygous for a certain known disease and is unaffected.The other parent is homozygous normal.Under which circumstance would DNA testing be of value for their newborn son to ensure he does not suffer complications due to the disease?

A) The disease is PKU.
B) The disease is metabolic.
C) The disease is neurological.
D) The disease is X-linked.
E) The disease is autosomal.