This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'Catalase positive, beta-hemolvtic staphylococcus - \nSelect and explain. \nA. S. aureus, B. S. epidermidis, C. S.saprophyticus, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., S. aureus [Ref: Essentials of medical microbiology p. 779\\o All staphylococci are catalase positive,o Amongst staphylococci, staph, aureus is beta hemolytic,o Most species of coagulase negative staphylococcus species are non-hemolvtic.o b-hemolytic staphylococci - Staph, aureus.o Non-hemolytic staphylococci - Coagulase-negative staphylococci", 'role': 'assistant'}]