Question: Among the rivers with a United States of America basin country, which one has the smallest discharge?
Choices: Mississippi River
Ohio River
Columbia River
Missouri River
Amazon
Blues Brothers 2000
Rhine
Hudson River
River Thames
Danube
SPARQL: SELECT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "river" . ?e <basin_country> ?e_1 . ?e_1 <pred:name> "United States of America" .  ?e <discharge> ?pv . ?pv <pred:value> ?v .  } ORDER BY ?v LIMIT 1
Program:
function: Find
inputs: United States of America
function: Relate
dependencies: 0
inputs: basin country
backward
function: FilterConcept
dependencies: 1
inputs: river
function: SelectAmong
dependencies: 2
inputs: discharge
smallest
Answer: Missouri River