What is the {human} for {head coach} of {Boston Celtics}
Name the most senior coach of Boston's NBA team.
who is the head coach of boston Celtics?
SELECT DISTINCT ?x WHERE { ?x rdf:type ontology:human . resource:Boston_Celtics property:head_coach ?x }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q131371> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P286> . ?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:Q131371 wdt:P286 ?obj . ?obj wdt:P31 wd:Q5 } 
Brad Stevens