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': 'Subaortic stenosis is not associated with? \nSelect and explain. \nA. Ventricular septal defect, B. Aortic regargitation, C. Patent ductus arteriosus, D. Coarctation of aorta', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]