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
Endocarditis is most commonly seen in: 
Select and explain. 
A. Aortic stenosis., B. Mitral regurgitation., C. Patent ductus arteriosus., D. Venous bypass graft.
A: Aortic stenosis.
Answer: A: Aortic stenosis. 
Explanation: None