Question: What open cluster has the largest radius?
Paraphrase: In what open cluster is the radius bigger?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q11387 . ?ent wdt:P2120 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: NGC 281, Messier 37, Messier 26, Messier 46, Alpha Persei Cluster