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: Anatomy
[{'content': 'Myelin sheath in CNS is synthesized by : \nSelect and explain. \nA. Microglia, B. Schwann cell, C. Oligodendroglia, D. All', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. 011godendrocyte', 'role': 'assistant'}]