Question: What is the official website for the sport activity related to American football?
Choices: http://www.nba.com/rockets/
http://www.soonersports.com/sports/m-footbl/okla-m-footbl-body.html
http://www.thecure.com
http://www.miramax.com/movie/trainspotting
https://www.fcl.ch/
http://www.sony.net/
http://www.lefilm-paris.com/
http://www.regione.calabria.it/
http://www.melaka.gov.my
http://www.tournamentofroses.com/rosebowlgame/
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "activity" . ?e <sport> ?e_1 . ?e_1 <pred:name> "American football" .  ?e <official_website> ?pv .  }
Program:
function: Find
inputs: American football
function: Relate
dependencies: 0
inputs: sport
backward
function: FilterConcept
dependencies: 1
inputs: activity
function: QueryAttr
dependencies: 2
inputs: official website
Answer: http://www.tournamentofroses.com/rosebowlgame/