Question: A 32-year-old man with no history of interest or cardiovascular risk factors. Clinic of dyspnea when climbing a floor of stairs of 1 month of evolution. Consultation due to sudden syncope preceded by exertion. Family history of death not explained abruptly in his brother. On physical examination, a more audible rumen systolic murmur with aortic focus is highlighted. The electrocardiogram performed in the consultation shows a sinus rhythm with a compatible pattern of left ventricular hypertrophy. An echocardiogram was performed to document an important asymmetric hypertrophy of the interventricular septum with a subvalvular dynamic gradient of 70 mmHg with moderate secondary mitral regurgitation and preserved left ventricular ejection fraction. Which therapeutic option is the LESS indicated? 
 Options:  <1> Beta-blockers. <2> Digoxin <3> Calcium-non-dihydropyridine antagonists. <4> Implantable automatic defibrillator. <5> Surgical septal myomectomy of Morrow.
2