Question: Which antiparticle of the antineutron has the longest mean lifetime ?
Paraphrase: Which antineutron antiparticle has the longest average lifespan?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q22675015 . ?ent wdt:P2645 ?obj . ?ent wdt:P2152 wd:Q156530 } ORDER BY DESC(?obj)LIMIT 5 
Answer: neutron