Question: Whose Twitter username is Sting?
Choices: Sean Penn
Max Fleischer
William Henry Harrison
Jessica Walter
Jerry Seinfeld
Sting
John Schlesinger
Sylvester Stallone
Richard Gere
David Thewlis
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "human" . ?e <Twitter_username> ?pv . ?pv <pred:value> "Sting" .  }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: Twitter username
Sting
function: FilterConcept
dependencies: 1
inputs: human
function: What
dependencies: 2
Answer: Sting