This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Amino acid Metabolism, Subject name: Pediatrics
[{'content': 'A child with subluxation of lens and mental retardation died. Which of the following would have helped in his treatment? \nSelect and explain. \nA. Biotin, B. Pyridoxine, C. Zinc, D. Riboflavin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Subluxation of lens and mental retardation in a child who died suggests underlying homocystinuria Pyridoxine (vitamin B6) is useful in its treatment', 'role': 'assistant'}]