This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Valvular Heart Disease, Subject name: Medicine
The most common complication of Sub-valvular Aortic Stenosis is - 
Select and explain. 
A. Aortic Regurgitation, B. Mitral Regurgitation, C. Tricuspid Regurgitation, D. Pulmonary Regurgitation
A: Aortic Regurgitation
Answer: A: Aortic Regurgitation 
Explanation: Ans. is 'a' i.e., Aortic Regurgitation o Aortic regurgitation is the most common complication of subaortic stenosis.o Note that Aortic regurgitation is not a congenital anomaly associated with subvalvular aortic stenosis.# Aortic regurgitation is a complication of subvalvular# The aortic regurgitation appears to be due to thick fibrous tissue on the left ventricular swface of the valve leaflets. The fibrosis is caused by the repetitive trauma from a jet of blood through the stenosis or by the proliferation of the fbroelastic membrane itself.