This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Myelin forming cells in cns \nSelect and explain. \nA. Oligodendrocytes, B. Schwancells, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Oligodendrocytes are the myelin forming cells of the cns One cell can myelinate 30 neurons Ref:Guyton and Hall textbook of medical physiology 12th edition,page number:72,73', 'role': 'assistant'}]