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': "Cause of Opaque hemithorax \nSelect and explain. \nA. Poland's syndrome, B. Mcleod's syndrome, C. Congenital lobar emphysema, D. Foreign body", 'role': 'user'}, {'content': 'Answer: D \nExplanation: A, b, c are causes of U/L hypertranslucent hemithorax.', 'role': 'assistant'}]