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 botulinum, the nonneurotoxic one is: \nSelect and explain. \nA. A, B. D, C. Cl, D. C2', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is. 'd' i. e. D", 'role': 'assistant'}]