Question: What is the official website of the contemporary folk band?
Choices:
http://www.jerrydouglas.com/
https://shakhtar.com/
http://paul-auster.com/
http://www.ge.com
https://www.london.gov.uk/
http://www.theincrediblestringband.com/
http://www.billypreston.net/
http://www.achtzehn99.de/
https://www.marriott.com/
http://www.munkyourself.com/
Answer: http://www.theincrediblestringband.com/
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "band" . ?e <genre> ?e_1 . ?e_1 <pred:name> "contemporary folk music" .  ?e <official_website> ?pv .  }
Program:
function: Find
inputs: contemporary folk music
function: Relate
dependencies: 0
inputs: genre
backward
function: FilterConcept
dependencies: 1
inputs: band
function: QueryAttr
dependencies: 2
inputs: official website