text: <unk>  infection is caused by<unk> , an enveloped, single stranded positive sense RNA virus.<unk>  is a type of flavivirus. Mosquitoes are the primary disease vector of<unk> .
option_0: Zika virus
option_1: California encephalitis virus
option_2: Eastern equine encephalitis virus
option_3: Kunjin virus
option_4: Dengue virus
option_5: Chikungunya virus
option_6: Ebola virus
option_7: West nile virus