Why are most infants with phenylketonuria usually healthy at birth?
A) The defect causing the condition has usually been repaired by that time.
B) The mother breaks down phenylalanine for both herself and her fetus.
C) The infant can produce sufficient quantities of the enzymes needed by birth.
D) Phenylalanine can be completely excreted in infants.
E) Phenylalanine is completely metabolized in infants.
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