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': 'Tick born relapsing fever is/are caused by - \nSelect and explain. \nA. Borrelia recurrentis, B. Borrelia duttonii, C. Borrlia burgdorferi, D. All', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Borrelia duttonii", 'role': 'assistant'}]