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': 'Which of the following is not an example of macroglia? \nSelect and explain. \nA. Schwann cells, B. Oligodendrocytes, C. Astrocytes, D. None of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: There are three types of macroglia: oligodendrocytes, Schwann cells, and astrocytes Ref: Ganong's Review of Medical Physiology 23rd edition, Chapter 4.", 'role': 'assistant'}]