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
Bacteria showing antigenic variation - 
Select and explain. 
A. Yersinia, B. Bordetella, C. Brucella, D. Borrelia
D: Borrelia
Answer: D: Borrelia 
Explanation: Bacteria showing antigenic variation are :-

Neisseria (Meningococci, Gonococci)
Streptococcus spp
Mycoplasma
Borrelia burgdorferi