Which of the following conditions is characterized by an inability to convert phenylalanine to tyrosine due to a deficiency of the enzyme phenylalanine hydroxylase?

A Albinism
B Phenylketonuria (PKU) ✓
C Homocystinuria
D Maple syrup urine disease

Explanation

Phenylketonuria (PKU) is a genetic disorder caused by a deficiency of the enzyme phenylalanine hydroxylase, leading to an accumulation of phenylalanine in the body.

Source

NCBI Genetic Disorders Database
Metabolic and Nutritional Disorders Genetics and Metabolism Amino acid disorders Hard MEDICAL Confidence: high