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
[{'content': 'False about Q fever \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Only Ricketssial disease without any vector.', 'role': 'assistant'}]