Question: What film was written by Dario Argento?
Choices: Brokeback Mountain
Talk to Her
Eternal Sunshine of the Spotless Mind
The Phantom of the Opera
Night at the Museum: Battle of the Smithsonian
Babylon 5: The Gathering
A Prairie Home Companion
Changeling
Rebecca
Pleasantville
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "visual artwork" . ?e <screenwriter> ?e_1 . ?e_1 <pred:name> "Dario Argento" .   }
Program:
function: Find
inputs: Dario Argento
function: Relate
dependencies: 0
inputs: screenwriter
backward
function: FilterConcept
dependencies: 1
inputs: visual artwork
function: What
dependencies: 2
Answer: The Phantom of the Opera