What is the {human} for {head of state} of {Soviet Union}
Who is the Soviet Union's head of state?
Who is the Soviet Union's head of state?
SELECT DISTINCT ?o WHERE { ?o rdf:type ontology:human . resource:Soviet_Union property:head_of_state ?o }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q15180> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P35> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q5> } 
 select distinct ?obj where { wd:Q15180 wdt:P35 ?obj . ?obj wdt:P31 wd:Q5 } 
Mikhail Gorbachev