Question: What is the Class IB flammable liquid with the highest upper flammable limit whose instance of is occupational carcinogen?
Paraphrase: Which Class IB flammable liquid, whose occupational instance is carcinogen, possessing the largest upper flammable limit?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q21009055 . ?ent wdt:P2203 ?obj . ?ent wdt:P31 wd:Q21074597 } ORDER BY DESC(?obj)LIMIT 5 
Answer: 1,1-dimethylhydrazine, methylhydrazine, aziridine, dioxane, acrylonitrile