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': 'Toxicity of leigonella is due to: \nSelect and explain. \nA. Capsule, B. Toxin, C. Phage, D. Plasmid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Toxin', 'role': 'assistant'}]