Question: Which star classified in the Arcturus category has the highest color index?
Paraphrase: In the Arcturus star category, which star has the highest color index?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q523 . ?ent wdt:P1458 ?obj . ?ent wdt:P910 wd:Q15099767 } ORDER BY DESC(?obj)LIMIT 5 
Answer: Arcturus