This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
[{'content': 'Gas gangrene can be caused by all Except \nSelect and explain. \nA. Clostridium sporogenes, B. Clostridium bifermentans, C. Clostridium septicum, D. Clostridium difficile', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Clostridium difficile causes pseudomembranous colitisThe common causative organism is Clostridium perfringens, a spore-forming, Gram-positive saprophyte that flourishes in anaerobic conditions. Other organisms implicated in gas gangrene include C. bifermentans, C. septicum and C. sporogenes. Non-clostridial gas-producing organisms, such as coliforms, have also been isolated in 60-85 percent of cases of gas gangreneBailey and love 26e pg: 429', 'role': 'assistant'}]