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: Physiology
[{'content': 'Which of the following is not a type of microglia \nSelect and explain. \nA. Oligodendrocyte, B. Schwann cells, C. Spirocytes, D. Astrocytes', 'role': 'user'}, {'content': 'Answer: C \nExplanation: There are three types of microglia: oligodendrocytes, Schwann cells, and astrocytes.', 'role': 'assistant'}]