Question: Who is {doctoral student} of {James D. Watson}?
Paraphrase: Who is {doctoral understudy} of {James D. Watson}?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q83333 wdt:P185 ?obj . ?obj wdt:P31 wd:Q5 } 
Answer: Mario Capecchi, H. Robert Horvitz, Joan A. Steitz, Peter Moore