Question: Which instrument category is designated by Hornbostel-Sachs code 421.121.12?
Choices: Timbales
oboe
hurdy-gurdy
didgeridoo
melodica
electric violin
alto flute
xylophone
gong
goblet drum
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "class of instruments" . ?e <Hornbostel-Sachs_classification> ?pv . ?pv <pred:value> "421.121.12" .  }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: Hornbostel-Sachs classification
421.121.12
function: FilterConcept
dependencies: 1
inputs: class of instruments
function: What
dependencies: 2
Answer: alto flute