You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: THE FICTIONAL LAND OF OZ 
Clue: This paving material of the road to the Emerald City is in need of repairs
yellow brick

Category: STATS FREAK 
Clue: Wilt Chamberlain & this '60s Celtic are the only NBAers to average more than 20 rebounds per game
bill russell

Category: HI, I "Q" 
Clue: It's a synonym for idiosyncrasy

quirk