3rd hand in tourny with AK, fold this flop?

[ThaHero]

PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (9 handed) converter

Hero (t1500)
CO (t1680)
Button (t1420)
SB (t1460)
BB (t1620)
UTG (t1500)
UTG+1 (t1320)
MP1 (t1500)
MP2 (t1500)

Preflop: Hero is MP3 with K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises to t100</font>, <font color="#666666">1 fold</font>, Button calls t100, <font color="#666666">2 folds</font>.

Flop: (t230) T[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t200</font>, <font color="#CC3333">Button raises to t400</font>, <font color="#CC3333">Hero ???