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
William's syndrome is associated with 
Select and explain. 
A. Congenital Supravalvular Aoic stenosis, B. Congenital Subvalvular Aoic stenosis, C. VSD, D. ASD
A: Congenital Supravalvular Aoic stenosis
Answer: A: Congenital Supravalvular Aoic stenosis 
Explanation: 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)