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: Microbiology
[{'content': 'All the following amoebae live in the large intestine except - \nSelect and explain. \nA. E.coli, B. E. nana, C. E.gingivalis, D. Lbutschii', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., E. gingivalis", 'role': 'assistant'}]