This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Pediatrics
The most common cause of stridor in infant and children is: 
Select and explain. 
A. Congenital subglottic stenosis, B. Laryngomalacia, C. Vocal Cord Paralysis, D. Foreign body in airway
B: Laryngomalacia
Answer: B: Laryngomalacia 
Explanation: b. Laryngomalacia(Ref: Nelson's 20/e p 2036; Ghai 8/e p 369)Laryngomalacia is the most common cause of stridor in infants and children.