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
[{'content': 'Bacteria showing antigenic variation - \nSelect and explain. \nA. Yersinia, B. Bordetella, C. Brucella, D. Borrelia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Bacteria showing antigenic variation are :-\n\nNeisseria (Meningococci, Gonococci)\nStreptococcus spp\nMycoplasma\nBorrelia burgdorferi', 'role': 'assistant'}]