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Question

Assertion :Phenylketonuria is a recessive hereditary disease caused by body's failure to oxidize an amino acid phenylalanine to tyrosine, because of a defective enzyme. Reason: It results in the presence of phenylalanine acid in urine.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Both Assertion and Reason are incorrect.
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Phenylketonuria is a recessive hereditary disease caused due to the absence of enzyme phenylalanine hydroxylase that converts phenylalanine into tyrosine. It results in a high level of phenylalanine in blood tissue fluids and urine. Both the assertion and reason are true, but reason in not the correct explanation of assertion.

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