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
[{'content': 'Tracheostomy is not indicated in: \nSelect and explain. \nA. Emphysema, B. Bronchiectosis, C. Atelectasis, D. Pneumothorax', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]