This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Antigenic variation is seen in 
Select and explain. 
A. Treponema pallidum, B. Neisseria, C. Corynebacterium, D. Borrelia recurrentis
D: Borrelia recurrentis
Answer: D: Borrelia recurrentis 
Explanation: * Borrelia readily undergoes antigenic variation in vivo and this is believed to be the reason for the occurrence of relapse in the disease. Antigenic variation has been shown to be caused by DNA rearrangement in linear plasmid present in Borrelia. Ref: Baveja textbook of microbiology; 4th edition