This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'Enzyme-deficient in Alkaptonuria \nSelect and explain. \nA. Phenylalanine hydroxylase, B. Cystathionine synthase, C. Homogentisic acid oxidase, D. Tyrosinase', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]