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Assertion (A): Accumulation of phenylalanine in the brain results in mental retardation in Phenylketonuria.
Reason (R): The affected person lacks phenylalanine which is therefore not converted to tyrosine.

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Assertion (A) is true, but. Reason (R) is false.

Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).

Assertion (A) is false, but Reason (R) is true.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

answer is C.

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Detailed Solution

In phenylketonuria there is a mutation in phenylalanine hydroxylase.
As a result phenylalanine is not converted to tyrosine.

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