This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Travellers diarrhoea is caused by \nSelect and explain. \nA. Shigella, B. Escherichia coli, C. Entamoeba histolytica, D. Giardiasis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Enterotoxigenic E.coli (ETEC): Diarrhea caused by ETEC is of two epidemiological types Endemic in developing countries causing watery diarrhea to fatal disease. Traveller's diarrhea seen in persons from non-endemic areas visiting endemic areas. Ref: Textbook of microbiology; Ananthanarayan and paniker's; 10th Edition; Pg:285", 'role': 'assistant'}]