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': 'Bartonella quintana causes - \nSelect and explain. \nA. Trench fever, B. Scrub typhus, C. Endemic typhus, D. Epidemic typhus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Trench fever, also called 5-day fever or quintan fever, is caused by Bartonella Quintana (Rochalimaea Quintana).\n\xa0The human body louse (Pediculus humanus corporis) is the vector and humans is the only known reservoir', 'role': 'assistant'}]