This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Aggravation of symptoms of angina in a patient when given nitrates is seen in- \nSelect and explain. \nA. Aoic regurgitation, B. Mitral regurgitation, C. Single left coronary aery stenosis, D. Idiopathic hyperophic subaoic stenosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In subaoic stenosis, if vasodilators are given, it reduces the afterload, hence increasing the pressure gradient between the LV and aoa. This increases the ejection murmur. Ref Davidson 23rd edition pg 441', 'role': 'assistant'}]