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': 'A 23 year old patient had fever since 2 weeks presents with mitral valve vegetation. Patient is a intravenous drug abuser. Most common cause of endocarditis in this patient is : \nSelect and explain. \nA. S.aureus, B. S.epidermidis, C. Enterococcus, D. Viridans Streptococci', 'role': 'user'}, {'content': 'Answer: C \nExplanation: i.v. drug abusers\n\nLt. sided endocarditis – Enterococcus\nRt. sided endocarditis –\xa0S.aureus', 'role': 'assistant'}]