This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Medicine
A 47-year-old man is found to have edema, ascites, and hepatosplenomegaly. The examination of his neck veins reveals elevated venous pressure with a deep y descent. Heart size on x-ray is normal. Which of the following etiologies is not a possible explanation for this syndrome? 
Select and explain. 
A. rheumatic fever, B. TB, C. unknown cause, D. previous acute pericarditis
A: rheumatic fever
Answer: A: rheumatic fever 
Explanation: Commonly, no cause is found for constrictive pericarditis. Some patients do give a history of previous acute pericarditis. TB is now an uncommon cause. Cancer can cause constriction but is uncommon. Rheumatic fever does not cause pericarditis.