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
Restrictive and constrictive pericarditis occurs together in 
Select and explain. 
A. Radiation, B. Adriamycin, C. Amyloidosis, D. Post cardiotomy syndrome
A: Radiation
Answer: A: Radiation 
Explanation: Ans. is 'a' i.e., Radiation