This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Larynx, Subject name: ENT
Most common cause of stridor in children is: 
Select and explain. 
A. Laryngomalacia, B. Congenital laryngeal paralysis, C. Foreign body in larynx, D. Congenital laryngeal tumours
A: Laryngomalacia
Answer: A: Laryngomalacia 
Explanation: (Laryngomalacia) (272-D)Laryngomalacia - (congenital laryngeal stridor)* It is the most common condition causing an inspiratory stridor at or shortly after birth.* It may persist throughout infancy & disappears by 2 years of age* Stridor increased on crying but subsides on placing the child in prone position, cry is normal.* Foreign bodies in the larynx are uncommon because they are either coughed out or causes fatal obstruction within a few minutes. If helps is not to hand.