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
What is trench fever: 
Select and explain. 
A. Q-fever, B. 5-days fever, C. Boutonneuse fever, D. Indian tick typhus
B: 5-days fever
Answer: B: 5-days fever 
Explanation: Ans. is. 'b' i. e., 5-days fever