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
How to differentiate between staphylococci and micrococci? 
Select and explain. 
A. Catalase test, B. Modified Oxidase test, C. Gram staining, D. AFS
B: Modified Oxidase test
Answer: B: Modified Oxidase test 
Explanation: 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