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
Infective endocarditis is least common in : 
Select and explain. 
A. Mitral stenosis., B. Aortic stenosis., C. VSD., D. ASD.
D: ASD.
Answer: D: ASD. 
Explanation: None