This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lab Investigations, Subject name: Microbiology
[{'content': 'Catalase positive, coagulase negative beta hemolytic bacteria \nSelect and explain. \nA. Strep pyogens, B. Staph aureus, C. CONS, D. Enterococci', 'role': 'user'}, {'content': 'Answer: C \nExplanation: All staphylococci are catalase positive. Amongst staphylococci, Staph. aureus and Staph haemolyticus (CONS) are beta hemolytic. Most species of coagulase negative staphylococcus species are non-hemolytic except Staph. haemolyticus.', 'role': 'assistant'}]