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
[{'content': 'Most common cause of stridor in children is: \nSelect and explain. \nA. Laryngomalacia, B. Congenital laryngeal paralysis, C. Foreign body in larynx, D. Congenital laryngeal tumours', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (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.', 'role': 'assistant'}]