Question: What is the OSM tag or key for the natural disaster that is studied by geology?
Choices: Tag:generator:source=wind
Tag:amenity=prison
Tag:denomination=presbyterian
Tag:sport=rowing
Tag:cuisine=german
Tag:denomination=orthodox
Tag:natural=volcano
Tag:denomination=greek_orthodox
Tag:sport=beachvolleyball
Tag:sport=rugby_league
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "natural disaster" . ?e <studied_by> ?e_1 . ?e_1 <pred:name> "geology" .  ?e <OSM_tag_or_key> ?pv .  }
Program:
function: Find
inputs: geology
function: Relate
dependencies: 0
inputs: studied by
backward
function: FilterConcept
dependencies: 1
inputs: natural disaster
function: QueryAttr
dependencies: 2
inputs: OSM tag or key
Answer: Tag:natural=volcano