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': 'True about corynebacterium diptheria are all except: \nSelect and explain. \nA. Iron is required for toxin production, B. Toxin production is responsible for local reaction, C. Nonsporing, noncapsular and non-motile, D. Toxin production is by lysogenic conversion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]