Question: What is the OSM tag or key of old-growth forest?
Choices: Tag:denomination=seventh_day_adventist
Tag:sport=rugby_union
Tag:religion=taoist
Tag:religion=buddhist
Tag:shop=hairdresser
Key:drink:milk
Tag:generator:source=wind
Tag:natural=wood
Tag:sport=soccer
Tag:sport=badminton
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:name> "old-growth forest" . ?e <OSM_tag_or_key> ?pv .  }
Program:
function: Find
inputs: old-growth forest
function: QueryAttr
dependencies: 0
inputs: OSM tag or key
Answer: Tag:natural=wood