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: Medicine
[{'content': 'Paradoxical splitting of S2 is seen in \nSelect and explain. \nA. Pulmonary stenosis, B. Pulmonary hypeension, C. Aoic stenosis, D. Congenital absence of pulmonary valve', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Paradoxical splitting: Reverse of normal physiology, splitting of second hea sounds during expiration, singular during inspiration Seen in conditions that cause delayed conduction down the left bundle (LBBB, pre-excitation of the right ventricle, right ventricular pacing, premature RV beats), aoic stenosis ref - Harrisons internal medicine 20e pg1802-1805', 'role': 'assistant'}]