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
[{'content': 'The most common complication of Sub-valvular Aoic Stenosis is: \nSelect and explain. \nA. Aoic Regurgitation, B. Mitral Regurgitation, C. Tricuspid regurgitation, D. Pulmonary Regurgitation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]