This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Physiology
[{'content': 'Schwann cells are supporting cells of: \nSelect and explain. \nA. CNS, B. PNS, C. ANS, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (B) PNS # CNS/PNS Supportive Cells:> Astrocytes--physical support, repair, K+ metabolism.> Microglia--phagocytosis.> Oligodendrocytes--central myelin production.> Schwann cells--peripheral myelin production.> Ependymal cells--inner lining of ventricles.', 'role': 'assistant'}]