What is the medium mountain stage with the lowest event distance whose general classification of race participants is Nairo Quintana ?
select ?ent where { ?ent wdt:P31 wd:Q20680270 . ?ent wdt:P3157 ?obj . ?ent wdt:P2321 wd:Q511856} ORDER BY ASC(?obj)LIMIT 5 
medium mountain stage: Q20680270 nairo quintana: Q511856