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: Pediatrics
[{'content': 'Maple syrup urine is due to defective decarboxylation of \nSelect and explain. \nA. Branched chain amino acids, B. Sulfur containing amino acids, C. Hydroxyl amino acids, D. Unbranched chain amino acids', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]