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': 'LEIGH disease is due to the accumulation of- \nSelect and explain. \nA. Glycogen, B. Pyrodoxine, C. Sphingomyelin, D. None', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'None'", 'role': 'assistant'}]