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': 'Among the toxin produced by clostridium botulinum, the non neurotoxic one is - \nSelect and explain. \nA. A, B. B, C. C1, D. C2', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]