A 72-year-old man with a 15-year history of hypertension (currently on amlodipine) presents to clinic with progressive dyspnea on exertion over 3 months. He denies orthopnea or paroxysmal nocturnal dyspnea. On physical examination, blood pressure is 158/92 mmHg, heart rate is 78/min and regular. Cardiac auscultation reveals a late-peaking systolic murmur at the right upper sternal border that decreases with Valsalva maneuver and handgrip but increases with squatting. Transthoracic echocardiography shows concentric left ventricular hypertrophy, an aortic valve area of 0.8 cm² (normal >1.0 cm²), peak aortic valve gradient of 65 mmHg, and a small amount of aortic regurgitation. Which of the following is the most likely diagnosis?

1. A)Hypertrophic cardiomyopathy with left ventricular outflow tract obstruction
2. B)Aortic stenosis secondary to valve calcificationGABARITO
3. C)Aortic regurgitation from chronic hypertension-induced aortic root dilation
4. D)Mitral regurgitation with secondary left ventricular hypertrophy
5. E)Restrictive cardiomyopathy with impaired diastolic function