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: Pediatrics
[{'content': 'If a 5–year-old child suddenly develops stridor, which one of the following would be the most likely diagnosis – \nSelect and explain. \nA. Laryngomalacia, B. Acute laryngo–tracheobronchitis, C. Foreign body aspiration, D. Acute epiglottitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]