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
[{'content': 'Which of the following is least likely to cause constrictive pericarditis - \nSelect and explain. \nA. Tuberculous pericardial effusion, B. Staphylococcal effusion, C. Post cardiac surgery, D. Acute rheumatic fever', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]