This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Pathology
[{'content': 'macrophage in the brain is \nSelect and explain. \nA. Schwann cells, B. Oligodendrocytes, C. Astrocytes, D. Microglia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer is option 4 Microglia are considered the resident macrophages of the brain given that they are the only myeloid cells present in the CNS parenchyma. Microglia perform both homeostatic and immune-related functions and constitute about 5-20% of all cells in the CNS. Ref of img :', 'role': 'assistant'}]