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
Least common site for vegetation is? 
Select and explain. 
A. Aoic Stenosis (AS), B. Mitral Stenosis (MS), C. Mitral Regurgitation (MR), D. Atrial Septal Defect (ASD)
D: Atrial Septal Defect (ASD)
Answer: D: Atrial Septal Defect (ASD) 
Explanation: Answer is D (ASD) Repeat Vegetations of infective endocarditis are least common with ASD amongst the options provided