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': "A person returns to Delhi from Bangladesh after 2 days and has diarrhoea. Stool examination shows RBC's in stool. The likely organism causing is - \nSelect and explain. \nA. Enteropathogenic E. Coli, B. Enterotoxigenic E. Coli, C. Salmonella typhi, D. Shigella dysenteriae", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]