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': 'Palpatory thud, audible slap is seen in- \nSelect and explain. \nA. Tracheal foreign body, B. Bronchial foreign body, C. Laryngeal foreign body, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]