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
Aggravation of symptoms of angina in a patient when given nitrates is seen in - 
Select and explain. 
A. Aortic regurgitation, B. Mitral regurgitation, C. Single left coronary artery stenosis, D. Idiopathic hypertrophic subaortic stenosis
D: Idiopathic hypertrophic subaortic stenosis
Answer: D: Idiopathic hypertrophic subaortic stenosis 
Explanation: None