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': "Kelly's medium is used in the isolation of - \nSelect and explain. \nA. Leptospira, B. Borrelia, C. Bartonella, D. Brucella", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]