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
Rapid X descent unlikely in 
Select and explain. 
A. Constrictive pericarditis, B. Cardiac tamponade, C. RVMI, D. Restrictive cardiomyopathy
C: RVMI
Answer: C: RVMI 
Explanation: Answer is C (RVMI) Rapid 'x' descent is rare in RVMI Feature Tamponade Constrictive Pericaditis Restrictive Cardiomyopathy RVMI Prominent x descent Present Usually present Present Rare Prominent y descent Absent Usually present Rare Rare