Question: What is the official website for the higher-education institution which is Fred Williamson's school?
Choices: http://www.foxsearchlight.com/kinsey/
http://omshantiom.erosentertainment.com/
http://www.stevehowe.com/
http://www.leamichelemusic.com
http://www.tlc.com/
http://www.northwestern.edu
http://www.beecake.com/
http://www.co.tulare.ca.us
http://www.avrillavigne.com
http://www.lancashire.gov.uk/
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "higher education institution" . ?e_1 <educated_at> ?e . ?e_1 <pred:name> "Fred Williamson" .  ?e <official_website> ?pv .  }
Program:
function: Find
inputs: Fred Williamson
function: Relate
dependencies: 0
inputs: educated at
forward
function: FilterConcept
dependencies: 1
inputs: higher education institution
function: QueryAttr
dependencies: 2
inputs: official website
Answer: http://www.northwestern.edu