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': "30 year old man has mitral valve vegetation. Patient is a iv drug abuser. Culture media used to isolate the organism responsible for this is \nSelect and explain. \nA. Bile aesculin agar, B. Mannitol salt agar, C. Ludlam's media, D. Thayer Martin media", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Left sided endocarditis in iv drug abuser.\n\nM/c organism responsible is Enterococcus', 'role': 'assistant'}]