<prompt> Williams syndrome is associated withCongenital Supravalvular Aoic stenosisCongenital Subvalvular Aoic stenosisVSDASD  <response>: A i.e. Congenital Supravalvular Aoic stenosis Williams 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 