A) albinism
B) porphyria
C) Wilson's disease
D) phenylketonuria
Correct Answer: D
Solution :
Phenylketonuria is a disorder caused by the defect in amino acid metabolism. Children suffering with phenylketonuria are unable to breakdown phcnyl pyruvic acid into hydroxy phcnyl pyruvic acid. Accumulation of phenyl pyruvic acid causes mental disorder.
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