This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'Only mycobacteria which produces exotoxin - \nSelect and explain. \nA. M. tuberculosis, B. M. Ajarinum, C. M. Ulcerans, D. M.Bavis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., M. Ulcerans * Buruli ulcer is caused by M. ulcerans.* It is the only mycobacteria producing a toxin.", 'role': 'assistant'}]