Question: Who is the human for field work of Sioux?
Paraphrase: Who is the human for field work of Sioux?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P101 wd:Q107434 . ?sbj wdt:P31 wd:Q5 } 
Answer: Red Cloud, American Horse, Spotted Elk, Young Man Afraid Of His Horses, Sitting Bull, Crazy Horse