<prompt> The most common cause of stridor in infant and children is:Congenital subglottic stenosisLaryngomalaciaVocal Cord ParalysisForeign body in airway  <response>: b. LaryngomalaciaRef: Nelsons 20e p 2036; Ghai 8e p 369Laryngomalacia is the most common cause of stridor in infants and children. 