This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Radiology
[{'content': 'All of the following are indirect radiologic signs of 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: <img alt="" src=" />', 'role': 'assistant'}]