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: Pathology
[{'content': 'What are gitter cells - \nSelect and explain. \nA. Astrocytes, B. Macroglia, C. Modified macrophages in CNS, D. Oligodendrocytes', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]