Question: WHICH IS THE OPTICAL TELESCOPR WITH THE MOST FOCAL LENGTH
Paraphrase: What telescope has the most focal length?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q35273 . ?ent wdt:P2151 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: Nordic Optical Telescope, VLT Survey Telescope, Siding Spring 2.3 m Telescope, Grubb 6 Inch Telescope, Extremely Large Telescope