This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'The following is the etiological agent of Rocky mountain spotted fever: \nSelect and explain. \nA. Rickettsia rickettsii, B. Rochalimaea quintana, C. Rickettsia tsutsugamushi, D. Coxiella burnetii', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Rickettsia Rickettsi SpeciesDiseaseVectorR. ProwazekiiEpidemic typhusLouseR. ProwazekiiBrill Zinsser diseaseLouseR. typhiEndemic typhusRat fleaR. RickettsiaRocky mountain spotted feverTickR. akariRickettsial poxGamasid miteOriental TsutsugamushiScrub typhusTrombiculid mite", 'role': 'assistant'}]