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': 'Enterotoxins are produced by all except - \nSelect and explain. \nA. Clostridium perfringens, B. Staphylococcus aureus, C. Streptococcus pyogenes, D. Bacillus cereus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]