This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Catalase test is used to differentiate ? \nSelect and explain. \nA. Staphylococcus aureus from staphylococcus epidermidis, B. Staphylococci from streptococci, C. Streptococcus pyogenes from other streptococci, D. None of the above', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Staphylococci from streptococci The catalase test is used to differentiate staphylococci (catalase-positive) from streptococci (catalase-negative). The enzyme, catalase, is produced by bacteria that respire using oxygen, and protects them from the toxic by-products of oxygen metabolism", 'role': 'assistant'}]