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: Medicine
False about Q fever 
Select and explain. 
A. Causative agent is Coxiella burnetii, B. Incubation period is 2-3 weeks, C. Vector is louse, D. Mode of transmission is inhalation of infected dust
C: Vector is louse
Answer: C: Vector is louse 
Explanation: Only Ricketssial disease without any vector.