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': 'Baonella quintana causes: \nSelect and explain. \nA. Trench fever, B. Scrub typhus, C. Endemic typhus, D. Epidemic typhus', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is. 'a' i. e., Trench fever", 'role': 'assistant'}]