This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'How to differentiate between staphylococci and micrococci? \nSelect and explain. \nA. Catalase test, B. Modified Oxidase test, C. Gram staining, D. AFS', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Micrococci:Micrococci are gram-positive cocci which occur mostly in pairs, tetrads or irregular clusters. They are catalase and modified oxidase positive and aerobic. They are ordinarily non-pathogenic. The resemble Staphylococci, but in general, they are large in size and tetrads. The common laboratory test used to differentiate between micrococci and staphylococci is modified oxidase test.Ref: Ananthanarayan 9th edition, p206', 'role': 'assistant'}]