TPGK re raised AI what to do

[Master_Shake]

PokerStars No-Limit Hold'em Tourney, Big Blind is t200 (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero (t6495)
BB (t3745)
UTG (t1695)
MP (t1985)
Button (t1080)

Preflop: Hero is SB with Q[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/club.gif[/img].
UTG calls t200, <font color="#666666">2 folds</font>, Hero completes, BB checks.

Flop: (t600) 5[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets t500</font>, BB folds, <font color="#CC3333">UTG raises to t1470</font>, Hero?????