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': 'Which one of the following statement is false about loculated pleural effusion? \nSelect and explain. \nA. They form obtuse angles against the mediastinum/chest wall when viewed in profile, B. They have unsharp margins when viewed enface, C. They do not conform to segmental distribution, D. The opacity may show air bronchogram', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Air bronchogram is the bronchi filled with air visualised against the surrounding opacified alveoli. Ref: Perinatal and Pediatric Respiratory Care By Brian K. Walsh, Michael P. Czervinske, Robe M. DiBlasi, 2009, Page 445', 'role': 'assistant'}]