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': "Auenbrugger's sign is seen in \nSelect and explain. \nA. Pericardial effusion, B. Mitral regurgitation, C. Cardiac tamponade, D. HOCM", 'role': 'user'}, {'content': "Answer: A \nExplanation: Bulging of the epigastrium (Auenbrugger's sign) seen in cases of large pericardial effusion.", 'role': 'assistant'}]