Question: Which cluster has the most metallic content?
Paraphrase: What cluster has the most metallic content?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q11276 . ?ent wdt:P2227 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: [PR95] 50873, [PR95] 51040, [JSD2015] AP 756, [PR95] 40181, 2MASX J00423322+4131244