Question: What is the official website of the college of the University of Cambridge that Ian McKellen attended?
Choices: http://www.dawgnet.com/
http://macombcountymi.gov
http://www.tribunemedia.com/
http://www.regione.sardegna.it
http://www.realracingclub.es/
http://www.sanjuancity.gov.ph/
http://www.terrehaute.in.gov
http://www.caths.cam.ac.uk/
http://www.stocktongov.com
http://www.willienelson.com/
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "college of the University of Cambridge" . ?e_1 <educated_at> ?e . ?e_1 <pred:name> "Ian McKellen" .  ?e <official_website> ?pv .  }
Program:
function: Find
inputs: Ian McKellen
function: Relate
dependencies: 0
inputs: educated at
forward
function: FilterConcept
dependencies: 1
inputs: college of the University of Cambridge
function: QueryAttr
dependencies: 2
inputs: official website
Answer: http://www.caths.cam.ac.uk/