Question: Which Japan prefecture has the official website http://www.pref.niigata.lg.jp?
Choices:
Ōsaka Prefecture
Kanagawa Prefecture
Aichi Prefecture
Fukuoka Prefecture
Niigata Prefecture
Gifu Prefecture
Chiba Prefecture
Fukushima Prefecture
Okinawa Prefecture
Miyagi Prefecture
Answer: Niigata Prefecture
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "prefecture of Japan" . ?e <official_website> ?pv . ?pv <pred:value> "http://www.pref.niigata.lg.jp" .  }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: official website
http://www.pref.niigata.lg.jp
function: FilterConcept
dependencies: 1
inputs: prefecture of Japan
function: What
dependencies: 2