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': "The causative agent of Lyme's disease: \nSelect and explain. \nA. Borrelia burgdorferi, B. Borrelia recurrentis, C. Leptospira icterohemorrhagiae, D. Clostridium difficile", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Borrelia burgdorferi', 'role': 'assistant'}]