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 can be done for ? \nSelect and explain. \nA. Salmonella, B. Streptococcus, C. Shigella, D. Pseudomonas', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Salmonella", 'role': 'assistant'}]