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: Radiology
[{'content': 'All of the following are indirect radiologic signs of the collapse of lung EXCEPT – \nSelect and explain. \nA. Mediastinal displacement, B. Hilar displacement, C. Compensatory hyperinflation, D. Loss of aeration', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Loss of aeration is a direct sign of lung collapse.\nOther three options are indirect signs of lung collapse.', 'role': 'assistant'}]