Question: Which website officially represents the National Register of Historic Places' parent agency?
Choices:
http://www.pbs.org/jefferson/
http://www.crete.gov.gr/
http://www.agf.dk/
http://www.albanylaw.edu
http://www.bandai.co.jp/
http://www.billyconnolly.com
http://www.miauk.com/
https://web.archive.org/web/20080912170009/http://www2.sega.com/gamesite/sonicnext/sonicnext_full/index.php#
http://www.nps.gov/
http://www.paranorman.com
Answer: http://www.nps.gov/
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "agent" . ?e_1 <parent_organization> ?e . ?e_1 <pred:name> "National Register of Historic Places" .  ?e <official_website> ?pv .  }
Program:
function: Find
inputs: National Register of Historic Places
function: Relate
dependencies: 0
inputs: parent organization
forward
function: FilterConcept
dependencies: 1
inputs: agent
function: QueryAttr
dependencies: 2
inputs: official website