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: Ans. is 'd' i.e., Borrelia Bacteria showing antigenic variation are :? i) Neisseria (Meningococci, Gonococci) ii) Streptococcus spp iii) Mycoplasma iv) Borrelia burgdorferi", 'role': 'assistant'}]