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
All the following are exceptions to Koch's postulates except? 
Select and explain. 
A. Mycobacterium Leprae, B. Treponema pallidum, C. Neisseria gonorrhoea, D. Vibrio cholerae
D: Vibrio cholerae
Answer: D: Vibrio cholerae 
Explanation: M leprae & T pallidum – Cannot be grown invitro however can be maintained in animals.
N gonorrhoea – There is no animal model, however bacteria can be grown in vitro.