Question: Who is Gottfried Wilhelm Leibniz's doctor
Paraphrase: Who is Gottfried Wilhelm Leibniz's doctor
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P184 wd:Q9047 . ?sbj wdt:P31 wd:Q5 } 
Answer: Christian Wolff, Jacob Bernoulli, Nicolas Malebranche