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': 'Toxoids are \nSelect and explain. \nA. antigenic and toxic, B. antigenic and non-toxic, C. non-antigenic and toxic, D. non-antigenic and non-toxic', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]