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
[{'content': 'Blood culture is positive in which infection of Staphylococcus aureus is \nSelect and explain. \nA. TSS, B. SSSS, C. Infective endocarditis, D. Impetigo', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Infections caused by methicillin-sensitive S aureus, high-magnitude bacteremia (defined as >4 positive blood cultures ), and endocarditis. The most impoant test is a blood culture used to identify bacteria in the bloodstream. REFERENCE: www.mayoclinic.org', 'role': 'assistant'}]