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
Pulsus paradoxus is a characteristic feature of 
Select and explain. 
A. Constrictive pericarditis, B. Cardiac Tamponade, C. Hypertrophic obstructive cardiomyopathy, D. Restrictive cardiomyopathy
B: Cardiac Tamponade
Answer: B: Cardiac Tamponade 
Explanation: None