Question: what is the class II combustible liquid with the lower flammable limit whose instance of is occupational caricinogen?
Paraphrase: which class II combustible liquid has a lower flammable limit and is carcinogenic?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q21009057 . ?ent wdt:P2202 ?obj . ?ent wdt:P31 wd:Q21074597 } ORDER BY DESC(?obj)LIMIT 5 
Answer: bis(2-chloroethyl)ether