Question: Name the irritant classified NFPA 704 with the highest enthalpy of vaporization ?
Paraphrase: What is the irritant with the highest enthalpy of vaporization?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q6073871 . ?ent wdt:P2116 ?obj . ?ent wdt:P4952 wd:Q51139288 } ORDER BY DESC(?obj)LIMIT 5