Question: What is the official website of the higher education institution whose headquarter location is Johannesburg?
Choices: http://www.wits.ac.za/
https://www.pixar.com/feature-films/toy-story
http://siouxsieandthebanshees.co.uk
http://www.secretintheireyes.movie/
http://channel.nationalgeographic.com/mars/
http://www.junglee.org.in
http://www.pku.edu.cn/
http://www.foxsearchlight.com/quills/
http://markknopfler.com
http://www.cityftmyers.com
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "higher education institution" . ?e <headquarters_location> ?e_1 . ?e_1 <pred:name> "Johannesburg" .  ?e <official_website> ?pv .  }
Program:
function: Find
inputs: Johannesburg
function: Relate
dependencies: 0
inputs: headquarters location
backward
function: FilterConcept
dependencies: 1
inputs: higher education institution
function: QueryAttr
dependencies: 2
inputs: official website
Answer: http://www.wits.ac.za/