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': "The process of 'phagocytosis' was discovered by \nSelect and explain. \nA. Celsus, B. Elie Metchnikoff, C. Virchow, D. None of the above", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]