Question: Which soccer club is headquartered in Washington, D.C.?
Choices: FC Volga Nizhny Novgorod
United States Navy
Barnsley F.C.
NPR
Washington Nationals
World Bank
D.C. United
Libertarian Party
Mamelodi Sundowns F.C.
AFC Wimbledon
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "association football club" . ?e <headquarters_location> ?e_1 . ?e_1 <pred:name> "Washington, D.C." .   }
Program:
function: Find
inputs: Washington, D.C.
function: Relate
dependencies: 0
inputs: headquarters location
backward
function: FilterConcept
dependencies: 1
inputs: association football club
function: What
dependencies: 2
Answer: D.C. United