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
Soldier injured in combat presenting with edema, crepitus, brown exudate 
Select and explain. 
A. Gas gangrene, B. Crush syndrome, C. Long bone fracture, D. None
A: Gas gangrene
Answer: A: Gas gangrene 
Explanation: 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.