This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Phenylalanine and Tyrosine metabolism Detail, Subject name: Biochemistry
[{'content': 'Positive Ferric chloride urine test is due to: \nSelect and explain. \nA. Phenylalanine, B. Phenylacetate, C. Phenylpyruvate, D. Phenylaspaate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Diagnostic test for phenylketonuria: This is a screening test in urine sample for phenyl ketones and hence gives positive result for phenyl pyruvate Positive for:- Phenylketonuria Tyrosinemia MSUD Alkaptonuria', 'role': 'assistant'}]