This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
Which of the following is most useful to differentiate micrococci from staphylococci? 
Select and explain. 
A. Catalase test, B. Hugh-Leifson test, C. Coagulase test, D. All of the above
B: Hugh-Leifson test
Answer: B: Hugh-Leifson test 
Explanation: The common lab test used to differentiate between micrococci and staphylococci is Hugh and Leifson's oxidation fermentation test in which micrococci show oxidative and staphylococci chow fermentative patterns. Both are members of the family Micrococaceae and both are catalase positive. Coagulase test differentiates between Staph. aureus and other coagulase-negative Staphylococci.