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': '"Dark Ground Illumination" helps to detect: \nSelect and explain. \nA. Leptospira, B. Treponema, C. Borrelia, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Treponema', 'role': 'assistant'}]