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': 'Palpatory thud, an audible snap is seen in \nSelect and explain. \nA. Tracheal foreign body, B. Bronchial foreign body, C. Laryngeal foreign body, D. Foreign body in ear', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A foreign body in trachea may move up and down the trachea between the carnia and the undersurface of vocal cords causing "audible slap" and "palpatory thud&;.Symptoms and signs of foreign bodies at different levelsSite of foreign bodiesSymptoms and signsLarynxChoking, Cyanosis, Complete obstruction leading to death* Paial obstruction: stridor, hoarseness, cough, respiratory difficultyTrachea* Choking, stridor, wheeze, cough, palpatory thud, audible slap* Cough, wheeze and diminished air entry to lung forms a "triad"Bronchi Respiratory distress with swelling of the foreign body* Lung collapse, emphysema, pneumonitis, bronchiectasis or lung abscess are late featuresRef: Hazarika; 3rd ed; Pg 651', 'role': 'assistant'}]