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. Virchow, B. Metchnikoff, C. Koch, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In the 1880s the Russian biologist Elie Metchnikoff discovered the process of phagocytosis by observing the ingestion of rose thorns by amebocytes of starfish larvae and of bacteria by mammalian leukocytes. Ref: Robbins 8th edition, Chapter 2.', 'role': 'assistant'}]