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
Most common cause of native valve endocarditis? 
Select and explain. 
A. Staphylococcus aureus, B. Coagulase negative staphylococcus, C. Streptococcus, D. Enterococcus
A: Staphylococcus aureus
Answer: A: Staphylococcus aureus 
Explanation: Ans. is 'a' i.e., Staphylococcus aureus See above explanation.