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': 'Soldier injured in combat presenting with edema, crepitus, brown exudate \nSelect and explain. \nA. Gas gangrene, B. Crush syndrome, C. Long bone fracture, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. Gas gangreneCrepitus in soft tissue is characteristic of gas gangrene.Edema, crepitus and brown exudate after injury suggest the diagnosis of gas gangrene.', 'role': 'assistant'}]