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': 'Restrictive and constrictive pericarditis occurs together in \nSelect and explain. \nA. Radiation, B. Adriamycin, C. Amyloidosis, D. Post cardiotomy syndrome', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Radiation", 'role': 'assistant'}]