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': 'For small pneumothorax, X-ray is done in: \nSelect and explain. \nA. Inspiration PA view, B. Expiration PA view, C. Lateral decubitus, D. Supine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Expiration PA view', 'role': 'assistant'}]