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': 'X-ray given below suggests \nSelect and explain. \nA. Normal x-ray, B. Hydatid cyst, C. ABPA, D. Hydropneumothorax', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The given image shows\n\nMediastinal shift to opposite side\nClear homogeneous Opacity with horizontal air - fluid level.\nSuggestive of hydropneumothorax', 'role': 'assistant'}]