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
The most common complication of Sub-valvular Aoic Stenosis is: 
Select and explain. 
A. Aoic Regurgitation, B. Mitral Regurgitation, C. Tricuspid regurgitation, D. Pulmonary Regurgitation
A: Aoic Regurgitation
Answer: A: Aoic Regurgitation 
Explanation: Answer is A (Aoic Regurgitation) Aoic regurgitation is the most common complication of subaoic stenosis. Aoic regurgitation is the most common complication of subaoic stenosis occurring in more than 50% of patients. Aoic Regurgitation is believed to be caused from Valvular damage due to the high-pressure Subvalvular systolic jet originating at the level of stenosis.