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: Surgery
[{'content': 'Spontaneous pneumothorax exceeding .....% of chest cavity should have a chest tube inseed - \nSelect and explain. \nA. 10, B. 25, C. 45, D. 60', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 25 Exact answer according to Schwaz in 30%.", 'role': 'assistant'}]