This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
[{'content': 'Most common cause of stridor in children is - \nSelect and explain. \nA. Laryngeal papilloma, B. Laryngeal web, C. Laryngomalacia, D. Vocal cord palsy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]