question: Q:A 60-year-old man comes to the emergency department because of a 2-day history of sharp chest pain and a nonproductive cough. The pain worsens with deep inspiration and improves when he leans forward. Three weeks ago, the patient was diagnosed with an ST-elevation myocardial infarction and underwent stent implantation of the right coronary artery. His temperature is 38.4°C (101.1°F) and blood pressure is 132/85 mm Hg. Cardiac auscultation shows a high-pitched scratching sound during expiration. An x-ray of the chest shows enlargement of the cardiac silhouette and a left-sided pleural effusion. Which of the following is the most likely underlying cause of this patient's current condition?? 
  {'A': 'Outpouching of ventricular wall', 'B': 'Occlusion of coronary artery stent', 'C': 'Embolism to left pulmonary artery', 'D': 'Immune response to cardiac antigens', 'E': 'Rupture of interventricular septum'},