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': '"Buruli" ulcer is caused by: \nSelect and explain. \nA. M. Ulcerans, B. M. Marinum, C. M. Kasasi, D. M. Fouitium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: M. Ulcerans', 'role': 'assistant'}]