This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Which of the following flavi virus is closely related to Russian spring summer encephalitis causing virus 
Select and explain. 
A. Dengue, B. Chikungunya, C. Yellow fever, D. KFD
D: KFD
Answer: D: KFD 
Explanation: None