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': 'A pt. died after a blunt trauma to chest Most common cause of death in blunt trauma to chest is ? \nSelect and explain. \nA. Oesophageal rupture, B. Tracheo bronchial rupture, C. Pulmonary laceration, D. Pneumothorax', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans is 'b' ie Tracheo bronchial rupture", 'role': 'assistant'}]