AK UI on flop OOP

[gmandan]

Party Poker No-Limit Hold'em, $ BB (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($47.50)
Hero ($80.43)
BB ($104.35)
UTG ($13.75)

Preflop: Hero is SB with K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img]. Hero posts a blind of $0.25.
UTG calls $0.50, <font color="#CC3333">Button raises to $2</font>, <font color="#CC3333">Hero (poster) raises to $5.75</font>, <font color="#666666">1 fold</font>, UTG folds, Button calls $4.

Flop: ($13) J[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero ...?

Any comments on the pf raise? Unfortunately, no reads on villain.