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: Medicine
[{'content': 'Regarding Modified duke’s criteria for Infective endocarditis,  all are true except \nSelect and explain. \nA. Positive blood culture for typical Infective endocarditis organisms from2 separate blood cultures, B. 2 positive cultures from samples drawn atleast 12 hours apart., C. Single positive blood culture positive for staphylococcus aureus, D. Phase 1 IgG antibody titer>1:800', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Single positive blood culture positive for coxiella burnetti is one of the criteria for diagnosis of Infective endocarditis.', 'role': 'assistant'}]