Question: Which flammable liquid carcinogen has the highest exposure limit?
Paraphrase: Which combustible fluid carcinogen has the most noteworthy introduction constrain?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q21009055 . ?ent wdt:P2406 ?obj . ?ent wdt:P31 wd:Q21074597 } ORDER BY DESC(?obj)LIMIT 5 
Answer: 1,2-dichloroethane