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 microscopy detects: \nSelect and explain. \nA. Leptospira, B. Borrelia, C. Treponema, D. Mycoplasma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Treponema', 'role': 'assistant'}]