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': 'A patient has prosthetic valve replacement and he develops endocarditis 8 months later. Most probable organism responsible is - \nSelect and explain. \nA. Stahylococcus aureus, B. Streptococcus viridans, C. Staphylococcus epidermidis, D. HACEK', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]