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
Palpatory thud audible slap is seen in: 
Select and explain. 
A. Tracheal foreign body, B. Bronchial foregion body, C. Laryngeal foreign body, D. None
A: Tracheal foreign body
Answer: A: Tracheal foreign body 
Explanation: 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."