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Solution
The correct option is A Disease Phenylketonuria, Symptom - Urine turns black on exposure to air
Phenylketonuria is an inherited error of metabolism caused by the
deficiency of enzyme phenylalanine hydroxylase. This enzyme is required
for the conversion of phenylalanine into tyrosine.Thus, deficiency of
this enzyme leads to over production of phenylalanine and its conversion
to phenyl. pyruvic acid and other derivatives, which accumulate in
cerebrospinal fluid leading to severe mental retardation, and also get
excreted in urine due to poor absorption by kidney. This disease is
inherited as an autosomal recessive trait. Alkaptonuria is the disease
in which urine turns black on exposure to air.
So, the correct answer is 'Disease Phenylketonuria, Symptom - Urine turns black on exposure to air'.