This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Ramkumar a 70-year-old hypertensive male Was admitted in the intensive care unit with transmural anterolateral myocardial infarction. His condition was stable till the fifth day of admission When he developed a pericardial friction rub and pleuritic chest pain which persisted despite narcotic and steroid therapy. On the seventh morning, he suddenly developed marked hypotension. On examination there was marked a 'tension of the jugular veins, accompanied a with electromechanical dissociation, Most likely, the patient had developed 
Select and explain. 
A. Severe acute mitral regurgitation, B. Ventricular septal rupture o, C. Right ventricular infarction, D. External cardiac rupture
D: External cardiac rupture
Answer: D: External cardiac rupture 
Explanation: None