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: Forensic Medicine
[{'content': 'Preformed toxin is seen in: CMC (Vellore) 13; COMEDK 15 \nSelect and explain. \nA. Staphylococcus aureus, B. Clostridium perfringens, C. Staphylococcus aureus, D. Clostridium perfringens', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Clostridium perfringens', 'role': 'assistant'}]