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
Following is NOT caused by virus: 
Select and explain. 
A. Rocky mountain spotted fever, B. KFD, C. Dengue, D. Yellow fever
A: Rocky mountain spotted fever
Answer: A: Rocky mountain spotted fever 
Explanation: Ans. (a) Rocky mountain spotted feverRef : K. Park 23rd ed. / 299-300Diseases, their causative agents and vectorsDiseaseCausative agentVectorRMSF (Rocky Mountain Spotted Fever)R. RickettsiiTickKyasanur forest disease (KFD) aka monkey diseaseGroup B togavirus (Flavivirus)Hard tick (in India);Soft tick (outside India)DengueArbovirus 4 serotypes (Den-1,2,3,4)Aedes AegyptiYellow feverFlavivirus fibricusAedes Aegypti