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.

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


[Q]: Category: THE NEW YORK TIMES OP-ED PAGE 
Clue: His 2005 farewell column said, "Never retire!"; he kept his Sunday magazine language column
[A]: william safire


[Q]: Category: OF PISA 
Clue: Begun in 1173, the 8-story Leaning Tower of Pisa is clad in this stone
[A]:
marble