Question: What is  doctoral advisor  of Johann Bernoulli  that is  it has a role  is  first doctoral advisor ?
Paraphrase: Is the role of Johann Bernoulli that of first doctoral advisor?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q227897 p:P184 ?s . ?s ps:P184 ?obj . ?s pq:P3831 wd:Q26236695 }