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
[{'content': 'Following are true of Kyasanur forest disease except: \nSelect and explain. \nA. Transmitted by soft tick, B. Caused by retrovirus, C. Incubation period is 3 - 8 days, D. Killed vaccine available', 'role': 'user'}, {'content': "Answer: B \nExplanation: 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.", 'role': 'assistant'}]