A young man complains of syncope, dyspnea and chest pain after exercise. A crescendo-decrescendo systolic murmur is heard over the left sternal border

[Joyce]

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A young man complains of syncope, dyspnea and chest pain after exercise. A crescendo-decrescendo systolic murmur is heard over the left sternal border without radiation. What is the most likely etiology?

A- Aortic dissection
B- Aortic regurgitation
C- Aortic stenosis
D- Hypertrophic cardiomyopathy