This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': "Beck's triad of cardic tamponade includesa) Hypotensionb) Neck vein distensionc) Silent heartd) Tachycardia \nSelect and explain. \nA. acd, B. abd, C. abc, D. ab", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]