Among the episodes with an award nominee or winner, which has the highest percent of 5 star votes?
highest percent of 5 star votes refers to max(percent) where star = 5
SELECT T1.episode_id FROM Award AS T1 INNER JOIN Vote AS T2 ON T2.episode_id = T1.episode_id WHERE T2.stars = 5 ORDER BY T2.percent DESC LIMIT 1;