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': 'Borelia vincenti is a \nSelect and explain. \nA. Mycoplasma, B. Mycobacteria, C. Spirochaete, D. Chlamydia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]