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
[{'content': "Beck's triad is seen in: \nSelect and explain. \nA. Cardiac tamponade, B. Constrictive Pericarditis, C. Restrictive cardiomyopathy, D. Hypertrophic cardiomyopathy", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. A. Cardiac tamponadeBeck's triad is seen in cardiac tamponade.It includes:* Hypotension* Soft or absent heart sounds* Jugular venous distention with a prominent x descent but an absent y descent.", 'role': 'assistant'}]