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
"Buruli" ulcer is caused by: 
Select and explain. 
A. M. Ulcerans, B. M. Marinum, C. M. Kasasi, D. M. Fouitium
A: M. Ulcerans
Answer: A: M. Ulcerans 
Explanation: M. Ulcerans