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': 'Traveller’s diarrhoea is most commonly caused by \nSelect and explain. \nA. ETEC, B. S. dysenteriae, C. EPEC, D. Salmonella', 'role': 'user'}, {'content': "Answer: A \nExplanation: Five types of E.coli include:\n1. ETEC (enterotoxogenic E.coli)\n2. EIEC (enteroinvasive E.coli)\n3. EPEC (enteropathogenic E.coli)\n4. EHEC (enterohemorrhagic E.coli)\n5. EAEC (enteroaggregative E.coli) \nTraveller's diarrhoea is most commonly caused by enterotoxogenic E.coli and then the other common\xa0organism responsible is S. dysenteriae. Intestinal Pathogenic E. Coli.", 'role': 'assistant'}]