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': 'Phage typing is useful as an epidemiological tool in all, except ? \nSelect and explain. \nA. Salmonella, B. Staph aureus, C. V. cholerae, D. Shigella dysenteriae', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Shigella dysenteriae", 'role': 'assistant'}]