This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Valvular Heart Disease, Subject name: Medicine
Pulsus paradoxus is seen in? 
Select and explain. 
A. Cardiac tamponade, B. Mitral regurgitation, C. Aortic regurgitation, D. Mitral stenosis
A: Cardiac tamponade
Answer: A: Cardiac tamponade 
Explanation: ANSWER:(A)Cardiac tamponadeREF:Harrison 18th Ed chapter 227See previous question