Question: Cambodia is the primary subject of how many visual artworks?
Choices: The Fly
The Killing Fields
Rebecca
Pleasantville
Transformers: Dark of the Moon
Gangs of New York
A Prairie Home Companion
Sucker Punch
On the Waterfront
The Aviator
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "visual artwork" . ?e <main_subject> ?e_1 . ?e_1 <pred:name> "Cambodia" .   }
Program:
function: Find
inputs: Cambodia
function: Relate
dependencies: 0
inputs: main subject
backward
function: FilterConcept
dependencies: 1
inputs: visual artwork
function: What
dependencies: 2
Answer: The Killing Fields