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
Staphylococcus differs from streptococcus by 
Select and explain. 
A. Coagulase test, B. Catalase test, C. Phosphatase, D. Gram negative
B: Catalase test
Answer: B: Catalase test 
Explanation: Staphylococcus is catalase positive, unlike streptococci which are catalase negative. Catalase test: positive test indicates production of catalase. Place a loopful of hydrogen peroxide on colonies on the nutrient agar. Prompt effervescence indicates catalase production. Ref: Textbook of Microbiology; Ananthanarayanan and Panicker; 10th Edition: pg;207