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': 'Most common organism for causing infective endocarditis in native valve - \nSelect and explain. \nA. Streptococcus Viridans, B. Enterococci, C. Staphylococci, D. Gram negative bacilli', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]