This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
A 63 yr old man present with a triad of angina, syncope and congestive hea failure. Which of the following valvular hea lesion can be suspected 
Select and explain. 
A. Mitral stenosis, B. Tricuspid regurgitation, C. Aoic stenosis, D. Aoic regurgitation
C: Aoic stenosis
Answer: C: Aoic stenosis 
Explanation: Ref Harrison 19 th ed pg 1530 patients with pure or predominant AS have gradually increas- ing obstruction over years but do not become symptomatic until the sixth to eighth decades. Adult patients with BAV disease, however, develop significant valve dysfunction and symptoms one to two decades sooner. Exeional dyspnea, angina pectoris, and syncope are the three cardinal symptoms.