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
The causative agent of Lyme's disease: 
Select and explain. 
A. Borrelia burgdorferi, B. Borrelia recurrentis, C. Leptospira icterohemorrhagiae, D. Clostridium difficile
A: Borrelia burgdorferi
Answer: A: Borrelia burgdorferi 
Explanation: Borrelia burgdorferi