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': 'Gas gangrene is \nSelect and explain. \nA. Caused by Clostridium perfringens., B. Gas and smell are characteristic., C. Antibiotic prophylaxis is essential when performing amputations to remove dead tissue., D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]