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': 'Phagocytosis is not done by - \nSelect and explain. \nA. NK cells, B. Histiocytes, C. WBC, D. Macrophages', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., NK cells", 'role': 'assistant'}]