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
. Beck's Triad Is seen in - 
Select and explain. 
A. Constrictive Pericarditis, B. Cardiac tamponade, C. Right ventricular myocardial infarction (RVM, D. Restrictive cardiomyopathy
B: Cardiac tamponade
Answer: B: Cardiac tamponade 
Explanation: Beck's triad is a pathognomic feature of cardiac tamponade Beck's triad is a collection of three medical signs associated with acute cardiac tamponade, an emergency condition wherein fluid accumulates around the hea and impairs its ability to pump blood. The signs are low aerial blood pressure, distended neck veins, and distant, muffled hea sounds. Ref Harrison 20th edition pg 1416