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': 'The tissue macrophages are derived from the \nSelect and explain. \nA. Neutrophil, B. Eosinophil, C. Monocyte, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]