What is {prevalence} of {dementia} that is {location} is {Americas} ?
What is the most common form of mental deterioration in North and Central America?
What’s the most common form of dementia in the Americas?
SELECT ?z WHERE { resource:Dementia property:prevalence ?k . ?k property:location resource:Americas . ?k property:prevalence ?z }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q83030> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1193> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P276> <http://wikidata.dbpedia.org/resource/Q828>
} 

SELECT ?obj WHERE { wd:Q83030 p:P1193 ?s . ?s ps:P1193 ?obj . ?s pq:P276 wd:Q828 }