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 congenital abnormality of the larynx is: \nSelect and explain. \nA. Laryngomalacia, B. Laryngeal web, C. Subglottic stenosis, D. Subglottic haemangioma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Laryngomalacia): Ref: 353-D (272-D 4th)LARYNGOMALACIA (Congenital Laryngeal strider) is the most common congenital abnormality of the larynx* The condition manifests at birth or soon after, and usually disappears by 2 years of age* It is characterized by excessive flaccidity of supraglottic larynx which is sucked in during inspiration producing stridor and sometimes cyanosis* Stridor is increased on crying but subsides on placing the child in prone position. Cry is normal* Direct laryngoscopy shows elongated epiglottis, curled upon itself (omega-shaped) floppy aryepiglottic folds and arytenoids* Treatment is conservative, Tracheostomy for severe respiratory obstruction.', 'role': 'assistant'}]