11. All of the following are characteristics of phenylketonuria EXCEPT:
(A) excretion of phenylpyruvate
(B) air oxidation causes urine to turn dark on standing
(C) treated by putting patient on a diet low in phenylalanine
(D) untreated patients suffer severe mental retardation
(E) deficiency or defect in phenylalanine hydroxylase.
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