This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Myocardial Infarction, Subject name: Pathology
A 66-year-old woman collapses while shopping and expires suddenly of cardiac arrest. Her past medical history is significant for long-standing type 2 diabetes mellitus. Her relatives note that she had complained of chest heaviness and shoness of breath for the past 2 weeks. Sterile fibrinous pericarditis and pericardial effusion are observed at autopsy. What additional finding would be expected during autopsy of this patient? 
Select and explain. 
A. Endocardial fibroelastosis, B. Marantic endocarditis, C. Mitral valve prolapse, D. Myocardial infarct
D: Myocardial infarct
Answer: D: Myocardial infarct 
Explanation: Fibrinous pericarditis may develop 2 to 10 weeks after a transmural myocardial infarction. Patients with long-standing diabetes mellitus are paicularly susceptible to coronary atherosclerosis and myocardial infarction. One fouh to one half of all nonfatal myocardial infarctions are asymptomatic. In such patients, sudden death usually reflects a cardiac arrhythmia.