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Question
Blackening of urine, when exposed to air is a metabolic disorder in human beings. This is due to
Options:
A .  Phenylalanine
B .  Tyrosine
C .  Valine replacing glutamine
D .  Homogentisic acid
Answer: Option D
:
D
Alkaptonuria (black urinedisease,blackbone disease, or alkaptonuria) is a rare inherited genetic disorder in which the body cannot process the amino acids phenylalanine and tyrosine, which occur in protein.Homogentisic acidand its oxidised form alkapton are excreted in theurine, giving it an unusually dark colour.

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