This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable Diseases, Subject name: Social & Preventive Medicine
[{'content': 'Epidemic ty phus cause & vector - \nSelect and explain. \nA. Rickettessiae prowazki & Louse, B. R. typhi & mite, C. R. conorii & tick, D. R. akari & mite', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e.. Rickettessiae prowazki & Louse Rickettsial diseasesDiseaseAgentInsect vectorMammalian reservoir1. Typhus groupa. Epidemic typhusb. Murine typhus (Endemic typhus)c. Scrub typhusR. prowazekiiR. typhiR. tsutsugamushiLouseFleaMiteHumansRodentsRodents2. Spotted fever groupa. Indian tick typhusb. Rocky mountain spotted feverc. Rickettsia] poxR.conoriiR.rickettsiiR.akariTickTickMiteRodents, dogsRodents, dogsMice3. Othersa. Q feverb. Trench feverC.bumetiiRocholimacaquintanaNilLouseCattle, sheep, goats.Humans", 'role': 'assistant'}]