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': 'Treatment of contaminated wound in Gas Gangrene isa) Debridement of woundb) Systemic penicillinc) Metronidazole Administrationd) Peroxide dressings \nSelect and explain. \nA. ac, B. ab, C. ad, D. bc', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]