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: Surgery
[{'content': 'Indication for tracheostomy are all, EXCEPT: \nSelect and explain. \nA. Flail chest, B. Head injury, C. Cardiac Tamponade, D. Foreign body', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Indications for tracheostomy are Flail chest, Head injury, Foreign body, Tetanus etc. Cardiac tamponade is not an indication for tracheostomy.', 'role': 'assistant'}]