Pediatrics A new born infant is diagnosed with phenylketonuria. The enzyme that is deficient is A Phenylamine oxidase B Tyrosine hydroxylase C Phenylalanine hydroxylase D Dihydropteridine reductase 💡 Explanation A new born infant is diagnosed with phenylketonuria. The enzyme that is deficient is ✓ Correct Answer: C. Phenylalanine hydroxylase