This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': "Cardiac defect in William's syndrome is \nSelect and explain. \nA. ASD, B. PS, C. VSD, D. Supravalvular aortic stenosis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) Supravalvular aortic stenosis # WILLIAMS SYNDROME shares some features with autism (such as difficulty understanding the state of mind of conversational partners) and Fetal alcohol syndrome (e.g., certain facial features, possible mental retardation, and negative potential outbursts), although persons with Williams generally possess very good social skills, such that this condition is sometimes called "cocktail- party syndrome. Supravalvular aortic stenosis is common', 'role': 'assistant'}]