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 ventricular hypertrophy is caused by all except \nSelect and explain. \nA. MS, B. MR, C. AS, D. AR', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]