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
Which of the following is most useful to differentiate Micrococci from Staphylococci 
Select and explain. 
A. Catalase test, B. Hugh Leifson test, C. Oxidase test, D. All of the above
B: Hugh Leifson test
Answer: B: Hugh Leifson test 
Explanation: Micrococci: gram-positive cocci which occur mostly in pairs, tetrads or irregular clusters. They are catalase and modified oxidase positive and aerobic. Non-pathogenic resemble staphylococci but in stained smears, the cells are generally larger and more gram variable than staphylococci and appear in tetrads. A common laboratory method to differentiate between micrococci and staphylococci is Hugh and Leifson's oxidation fermentation test in which micrococci show oxidative and staphylococci show fermentative patterns. Ref: Textbook of Microbiology; Ananthanarayanan and Panicker; 10th Edition; Page No: 209