<prompt> Thirteen pair of Ribs can be seen in all of the following except:Down syndromeHolt-Oram syndromeTurner syndromeIncontinentia pigmenti  <response>: a. Down syndromeRef: Pediatric Surgical Diagnosis pg 10, Ref: Nelsons 20e p 610-615, Ghai 8e p 637-639Thirteen pairs of ribs may be seen in: Aarskog syndrome Turner syndrome Holt-Oram syndrome Alagille syndrome Incontinentia pigmenti Fetal akinesia deformation sequence Idiopathic 