This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rickettsial Diseases, Subject name: Social & Preventive Medicine
Rocky mountain spotted fever is caused by- 
Select and explain. 
A. Rrickettsii, B. Rtyphi, C. Rconorii, D. Rakari
A: Rrickettsii
Answer: A: Rrickettsii 
Explanation: Ans. is 'a' i.e., R rickettsii DiseaseAgentInsect 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. Rickettsial poxR.conoriiR.rickettsiiR. akariTickTickMiteRodents, dogsRodents, dogsMice3. Othersa. Q feverb. Trench feverC.burnetii Rocholimaca quintanaNilLouseCattle, sheep, goats.Humans