This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
[{'content': "A 2-year-old intellectutually disabled child is having blue eyes, blonde hair and fair skin. He also have a peculiar body odour. What is the diagnosis? \nSelect and explain. \nA. MSUD, B. Isovaleric aciduria, C. Phenyl ketonuria, D. Canavan's disease", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Phenyl ketonuriaIdentifying features:* Blue eyes, blonde hair and fair skin is a classical description of a case of PKU. The child is intellectually disabled and they have mousy body odour.', 'role': 'assistant'}]