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': 'Reversed splitting of S2 heart sound is heard in \nSelect and explain. \nA. Ventricular septal defect, B. RBBB, C. Acute pulmonary embolism, D. LBBB', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Reversed splitting of heart sound S2 is seen in:\n\nAortic stenosis\nPDA\nComplete LBBB\nWPW syndrome\nChronic ischemic heart disease\nPost stenotic dilation of aorta secondary to aortic stenosis', 'role': 'assistant'}]