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': 'Tissue macrophages are called? \nSelect and explain. \nA. Monocytes, B. Histiocytes, C. Plasma cells, D. Epitheloid cells', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Histiocytes", 'role': 'assistant'}]