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
Not a pathogenic mycobacterium - 
Select and explain. 
A. M. paratuberculosis, B. M. kansasii, C. M. ulcerans, D. M. intracellulare
A: M. paratuberculosis
Answer: A: M. paratuberculosis 
Explanation: Ans. is 'a' i.e., M. paratuberculosis