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 of cardiac tamponade includes - 
Select and explain. 
A. Hypotension, B. Paradoxical pulse, C. TACHYCARDIA, D. Silent hea
A: Hypotension
Answer: A: Hypotension 
Explanation: 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 1526