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
Early postoperative complications of tracheostomy are all, except 
Select and explain. 
A. Apnoea, B. Haemorrhage, C. Pneumomediastinum, D. Tracheal stenosis
D: Tracheal stenosis
Answer: D: Tracheal stenosis 
Explanation: None