Button raises, SB calls, Q9s in BB

[betgo]

$100 MTT, 14 players left. Button is 21/12. Push, call, or fold?

PokerStars No-Limit Hold'em Tourney, Big Blind is t2000 (7 handed) internettexasholdem.com

Button (t41418)
SB (t84516)
Hero (t32216)
UTG (t18116)
MP1 (t49678)
MP2 (t18208)
CO (t124620)

Preflop: Hero is BB with Q[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
<font color="#666666">4 folds</font>, <font color="#CC3333">Button raises to t6000</font>, SB calls t5000, <font color="#CC3333">Hero ???