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
A patient has prosthetic valve replacement and he develops endocarditis 8 months later. Most probable organism responsible is - 
Select and explain. 
A. Stahylococcus aureus, B. Streptococcus viridans, C. Staphylococcus epidermidis, D. HACEK
C: Staphylococcus epidermidis
Answer: C: Staphylococcus epidermidis 
Explanation: None