What is the Irritant with the highest electrical conductivity whose instance of is Class II combustible liquid ?
select ?ent where { ?ent wdt:P31 wd:Q6073871 . ?ent wdt:P2055 ?obj . ?ent wdt:P31 wd:Q21009057 } ORDER BY DESC(?obj)LIMIT 5 
irritant: Q6073871 class ii combustible liquid: Q21009057