What is the {human} for {doctoral student} of {James D. Watson}
Who is {doctoral student} of {James D. Watson}?
 select distinct ?obj where { wd:Q83333 wdt:P185 ?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/Q83333> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P185> . ?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 {doctoral understudy} of {James D. Watson}?