This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Which of the following genetic disease results from a deficiency in the liver enzyme that converts phenylalanine to tyrosine? 
Select and explain. 
A. Albinism, B. Homocystinuria, C. Porphyria, D. Phenylketonuria
D: Phenylketonuria
Answer: D: Phenylketonuria 
Explanation: Phenylketonuria (PKU) is an inherited disorder of amino acid metabolism in which the affected individual lacks enzymes to metabolize phenylalanine.
Albinism is a condition that results in a defect in tyrosine metabolism and the inability to produce melanin.
Porphyria is an inherited disorder involving defects in heme synthesis.
Homocystinuria is a disorder in the metabolism of homocysteine, resulting in high levels of homocysteine and methionine in plasma and urine.