Question: Who has the Twitter username Gibbstack?
Choices: Richard Gere
James Stewart
Mark Robson
Henry Winkler
Max Fleischer
William Henry Harrison
LisaGay Hamilton
Robert Patrick
Ben Gibbard
Sylvester Stallone
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "human" . ?e <Twitter_username> ?pv . ?pv <pred:value> "Gibbstack" .  }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: Twitter username
Gibbstack
function: FilterConcept
dependencies: 1
inputs: human
function: What
dependencies: 2
Answer: Ben Gibbard