Question: What is the official website of the entertainment whose distributor is HBO?
Choices: http://www.oracle.com/solaris
http://www.realsongs.com/
http://www.universalpictures.com/manonthemoon/
http://pirates.disney.com/pirates-of-the-caribbean-at-worlds-end
http://www.countyofplumas.com
http://www.matthewmcconaughey.com/
http://www.jaymohr.com
http://www.telltalegames.com/gameofthrones/
http://www.robursiena.it
https://www.terrypratchettbooks.com
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "entertainment" . ?e <distributor> ?e_1 . ?e_1 <pred:name> "HBO" .  ?e <official_website> ?pv .  }
Program:
function: Find
inputs: HBO
function: Relate
dependencies: 0
inputs: distributor
backward
function: FilterConcept
dependencies: 1
inputs: entertainment
function: QueryAttr
dependencies: 2
inputs: official website
Answer: http://www.telltalegames.com/gameofthrones/