Results of Biochemical Tests Indicate an Infant Has Phenylketonuria (PKU)

Results of biochemical tests indicate an infant has phenylketonuria (PKU) . The parents ask what PKU means. Correct responses would include all the following except

A) PKU is an enzyme deficiency resulting in the inability to metabolize phenylalanine.
B) PKU is an inborn error of metabolism.
C) PKU results from a chromosome abnormality called nondisjunction.
D) PKU is transmitted as an autosomal recessive disorder.