Question: What geographic region containing igneous rock?
Choices: Atlantic Canada
Rocky Mountains
Piedmont
East River
contiguous United States
Lake District
Transylvania
Pacific Ocean
Alps
Antarctica
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "geographic region" . ?e <material_used> ?e_1 . ?e_1 <pred:name> "igneous rock" .   }
Program:
function: Find
inputs: igneous rock
function: Relate
dependencies: 0
inputs: material used
backward
function: FilterConcept
dependencies: 1
inputs: geographic region
function: What
dependencies: 2
Answer: Rocky Mountains