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 widely used for the intraspecies classification of one of the following bacteria ? \nSelect and explain. \nA. Staphylococci, B. E. coli, C. Klebsiella pneumoniae, D. Pseudomonas aeruginosa', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Staphylococci", 'role': 'assistant'}]