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': 'Tension pneumothorax due to fracture rib is treated by \nSelect and explain. \nA. Strapping, B. Tube drainage, C. IPPV, D. Internal fixation with open reduction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]