A 32-year-old woman with rheumatic mitral stenosis (MVA 1.2 cm²) presents with palpitations and dyspnea on exertion. She is in sinus rhythm with a heart rate of 92 bpm. Echocardiography confirms moderate-to-severe MS with no left atrial thrombus. What is the drug of choice for rate control and symptom relief in this patient?

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