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': 'True about chest trauma:a) ECG done in all cases a/w sternal fractureb) Under water seal drainage if a/w pneumothorax c) X-ray chest investigation of choiced) Urgent surgery needed in all cases \nSelect and explain. \nA. ab, B. bc, C. acd, D. abc', 'role': 'user'}, {'content': 'Answer: D \nExplanation: • Sternal fracture also constitute a marker for serious associated injuries, including myocardial contusion, myocardial rupture, esophageal perforation, airway injuries and thoracic aortic rupture.\n• In blunt cardiac injuries, ECG is the first diagnostic test.\n• Routine investigation in the emergency department of injury to the chest is based on clinical examination, supplemented by chest radiography.\n• In the unstable patient, chest radiography is the investigation of first choice, provided that it does not interfere with resuscitation.', 'role': 'assistant'}]