Question: What person born on 1887-9-16 discovered vitamin A?
Paraphrase: What individual born on 1887-9-16 observed vitamin A?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q18225 wdt:P61 ?answer . ?answer wdt:P569 ?x FILTER(contains(YEAR(?x),'1887'))}
Answer: Marguerite Davis