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': 'What is trench fever: \nSelect and explain. \nA. Q-fever, B. 5-days fever, C. Boutonneuse fever, D. Indian tick typhus', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is. 'b' i. e., 5-days fever", 'role': 'assistant'}]