This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
[{'content': 'Vi Phage typing is done for- \nSelect and explain. \nA. Salmonella, B. Streptococcus, C. Shigella, D. Pseudomonas', 'role': 'user'}, {'content': "Answer: A \nExplanation: 'Vi' phage typing is done for salmonella Phage typing is also done for - Vibrio cholerae Staphylococcus aureus Salmonella typhi Brucella C.Diphtheria Pseudomonas- morphotyping is done", 'role': 'assistant'}]