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': 'Pulsus paradoxus is not seen in: September 2010 \nSelect and explain. \nA. Cardiac tamponade, B. Constrictive pericarditis, C. Hyperophic cardiomyopathy, D. Severe COPD', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Hyperophic cardiomyopathy Pulsus paradoxus (PP), also paradoxic pulse or paradoxical pulse, is an exaggeration of the normal variation during the inspiratory phase of respiration, in which the blood pressure declines as one inhales and increases as one exhales. It is a sign that is indicative of several conditions including cardiac tamponade, pericarditis, chronic sleep apnea, croup, and obstructive lung disease (e.g. asthma, COPD)', 'role': 'assistant'}]