TPNK in Dry Sidepot

Just inside the money of a 180-person SnG. The pre-flop call is pretty much mandatory, right? How do you top pair on the flop?

PokerStars No-Limit Hold'em Tourney, Big Blind is t1200 (8 handed) converter

UTG+1 (t5326)
MP1 (t578)
MP2 (t17075)
CO (t21841)
Button (t16080)
SB (t17494)
Hero (t26911)
UTG (t5126)

Preflop: Hero is BB with 5[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">UTG raises to t5051</font>, <font color="#666666">3 folds</font>, CO calls t5051, <font color="#666666">2 folds</font>, Hero calls t3851.

Flop: (t14478) K[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">CO bets t3600</font>, <font color="#CC3333">Hero ???</font>

Final Pot: t52978