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
Johne's bacillus is: 
Select and explain. 
A. Corynebacterium pseudotuberculosis, B. M. Paratuberculosis, C. H. Acgipticus, D. Micrococcus
B: M. Paratuberculosis
Answer: B: M. Paratuberculosis 
Explanation: M. Paratuberculosis