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
Which one of the following micro-organism uses antigenic variation as a major means of variation as an evading host defences? 
Select and explain. 
A. Streptococcus pneumoniae, B. Borrelia recurrentis, C. Mycobacterium tuberculosis, D. Listeria monocytogenes
B: Borrelia recurrentis
Answer: B: Borrelia recurrentis 
Explanation: None