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
ABE (Acute Bacterial Endocarditis) is most commonly caused by: 
Select and explain. 
A. Staph. aureus, B. Str. Viridans, C. Str. hemolyticus, D. Esch. Coli
A: Staph. aureus
Answer: A: Staph. aureus 
Explanation: Staph. aureus