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': 'An expiratory film is particularly useful to detect \nSelect and explain. \nA. Pleuraleffusion, B. Pneumothorax, C. Pulmonary edema, D. Pulmonary infarct', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Best view for Pneumothorax - PA view in full expiration.', 'role': 'assistant'}]