What is the {human} for {doctoral advisor} of {Grigori Perelman}
Who is the doctoral adviser of Grigori Perelman ?
 select distinct ?obj where { wd:Q117346 wdt:P184 ?obj . ?obj wdt:P31 wd:Q5 } 
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q117346> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P184> . ?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> } 
Who is the doctoral counsel of Grigori Perelman ?