This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pleural Effusion & Pneumothorax, Subject name: Medicine
[{'content': 'Diagnosis on CXR is? \nSelect and explain. \nA. Congenital diaphragmatic hernia, B. Bochdalek hernia, C. Pneumothorax, D. Pneumo-mediastinum', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Pneumo mediastinumIn the area of arrows a continuous diaphragm sign is noted. Normally diaphragm is seen below lungs only. This kind of presentation is noted in pneumo-mediastinum.', 'role': 'assistant'}]