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
All of _the following may be seen in patient of cardiac tamponade except- 
Select and explain. 
A. raised JVP, B. Hypotension with narrowed pulse pressure, C. muffled hea sounds, D. atrial flutter
D: atrial flutter
Answer: D: atrial flutter 
Explanation: Beck's triad is a collection of three medical signs associated with acute cardiac tamponade Components of Beck's Triad Hypotension with a Narrowed Pulse Pressure Jugular Venous Distention Muffled hea Sounds Ref Harrison 20th edition pg 1456