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(D) $Phenylketonuria$ is an inborn error of metabolism that is inherited as an autosomal recessive trait.In this disorder,the affected individual lack

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All of the above

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(D) $Phenylketonuria$ is an inborn error of metabolism that is inherited as an autosomal recessive trait.In this disorder,the affected individual lacks an enzyme that converts the amino acid $Phenylalanine$ into $Tyrosine$.As a result,$Phenylalanine$ accumulates and is converted into $Phenylpyruvic$ acid and other derivatives.Accumulation of these in the brain results in mental retardation.These are also excreted through urine because of poor absorption by the kidney.Symptoms include mental retardation,reduction in hair,and reduction in skin pigmentation.

Choose the correct option for the symptoms of $Phenylketonuria$ $(PKU)$.

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