This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mycobacteria, Subject name: Microbiology
Buruli ulcer is caused by: 
Select and explain. 
A. M. tuberculosis, B. M. ulcerans, C. M. marinum, D. M. fortuitum
B: M. ulcerans
Answer: B: M. ulcerans 
Explanation: Ans: b (M. ulcerans) Ref: Ananthanarayan, 7th ed, p. 367M.ulcerans is the only toxin producing mycobacterium, causing buruli ulcer