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': 'Left vertricular hypertrophy is not a feature of \nSelect and explain. \nA. Mitral regurgitation, B. Isolated mitral stenosis, C. Isolated ventricular septal defect, D. Aortic stenosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]