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: Radiology
[{'content': "William's syndrome is associated with \nSelect and explain. \nA. Congenital Supravalvular Aoic stenosis, B. Congenital Subvalvular Aoic stenosis, C. VSD, D. ASD", 'role': 'user'}, {'content': "Answer: A \nExplanation: A i.e. Congenital Supravalvular Aoic stenosis William's Syndrome or Idiopathic Hypercalcemia of Infancy It is characterized by: Hypercalcemia d/ t abnormal sensitivity to vitamin D Supravalvular aoic stenosisQ & other congenital defects Mental retardation Elfin facies (Round face with full cheeks & lips)", 'role': 'assistant'}]