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': 'Aggravation of symptoms of angina in a patient when given nitrates is seen in - \nSelect and explain. \nA. Aortic regurgitation, B. Mitral regurgitation, C. Single left coronary artery stenosis, D. Idiopathic hypertrophic subaortic stenosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]