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': 'Non-pathogenic amoebae is/are - \nSelect and explain. \nA. E. histolytica, B. E.coli, C. Acanthanmoeba, D. All', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., E. coli Non-pathogenic amaebae are E.hamanni, E.coli, E.polecki, Endolimax nana, lodamoeba botschlii, and Dientamoeba fragilis.", 'role': 'assistant'}]