This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'Which one of the following does not cause pulsus paradoxus? \nSelect and explain. \nA. Severe aoic regurgitation, B. Cardiac tamponade, C. Constrictive pericarditis, D. Acute severe bronchial asthma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Causes of pulsus parodoxus :Cardiac - common with cardiac tamponade, infrequent with constrictive pericarditisPulmonary - bronchospasm as in severe asthma or emphysema, pulmonary embolismMiscellaneous - obesity possibility due to excessive compression of IVC at thoracic inlet, after thoracotomyHypovolemic shockSVC obstructionReversed pulsus paradoxus - inspiratory rise in aerial systolic and diastolic pressure.Seen in HOCM, during intermittent positive pressure breathing (IPPB), isometric ventricular rhythm.', 'role': 'assistant'}]