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
Tracheostomy is not indicated in: 
Select and explain. 
A. Emphysema, B. Bronchiectosis, C. Atelectasis, D. Pneumothorax
D: Pneumothorax
Answer: D: Pneumothorax 
Explanation: None