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: Microbiology
[{'content': 'All cause fournier gangrene except- \nSelect and explain. \nA. Staphylococcus, B. Streptococcus, C. Clostridium, D. Bacteroides', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]