question: Q:A 73-year-old man presents to the emergency department with acute substernal chest pain that began a few hours ago. The pain is described as a “pressure” that radiates to his left arm. His past medical history is significant for hypertension and hyperlipidemia. He is on chlorthalidone for his hypertension and simvastatin for hyperlipidemia. He has a 30 pack-year history of smoking and drinks 1-2 beers on weekends. His EKG shows ST depressions in the anterior precordial leads and he is given the proper medications and sent for emergency revascularization. Seven days later, he develops dyspnea that worsens in the supine position. Bibasilar crackles are heard on pulmonary auscultation. Cardiac exam reveals a new 3/6 holosystolic murmur best heard at the left sternal border. What is the most likely etiology of this patient’s new symptoms?? 
  {'A': 'Aortic stenosis', 'B': 'Ventricular wall aneurysm', 'C': 'Restrictive pericarditis', 'D': 'Papillary muscle rupture', 'E': 'Arrhythmia'},