This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Arboviruses, Subject name: Microbiology
Following are true of Kyasanur forest disease except: 
Select and explain. 
A. Transmitted by soft tick, B. Caused by retrovirus, C. Incubation period is 3 - 8 days, D. Killed vaccine available
B: Caused by retrovirus
Answer: B: Caused by retrovirus 
Explanation: Ans. is 'b' i.e., Caused by retrovirus(Ref: Ananthanarayan, 9th/e, p. 524 and 8th/e, p. 520)* KFD is a febrile disease associated with haemorrhages.* Caused by an arbovirus flavivirus (group B Togavirus).* Mode of transmission - Tick bite.* Incubation period - 3 - 8 days.* For population at risk, killed KFD vaccine is available.