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': 'Reverse split S2 is seen in - \nSelect and explain. \nA. Aoic stenosis, B. Aoic stenosis, C. Pulonary aery hypeension, D. Pulmonary stenosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. Aoic stenosisDecreased impedance of the systemic vascular bedProstenotic dilatation of the Aoa secondary to Aoic stenosis or regurgitation.Patent ductus aeriosus', 'role': 'assistant'}]