Question: Which chemical element has the highest thermal conductivity?
Paraphrase: What can be considered as the chemical element with greater thermal conductivity?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q11344 . ?ent wdt:P2068 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: copper, copper, copper, copper, copper