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': '"Rat Bite" fever is caused by: \nSelect and explain. \nA. Bacillus anthracis, B. Leptospira, C. Spirillum minus, D. Borellia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Spirillum minus', 'role': 'assistant'}]