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': 'Austin Flint Murmur is commonly mistaken for the murmur of: March 2007 \nSelect and explain. \nA. Mitral regurgitation, B. Pulmonary regurgitation, C. Tricuspid stenosis, D. Mitral stenosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Mitral stenosis', 'role': 'assistant'}]