This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
[{'content': 'Myelination in CNS is done by- \nSelect and explain. \nA. Astrocytes, B. Oligodendrocytes, C. Ependymal cells, D. Microglia', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Oligodendrocytes * Myelination in central nervous system - Oligodendrocytes* Myelination in peripheral nervous system - Schwann cell", 'role': 'assistant'}]