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': '"Steeple sign" seen in \nSelect and explain. \nA. Croup, B. Acule epiglottitis, C. Laryngmalacia, D. Quinry', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]