(55): AA early. Can I fold?

[leftysright]

PartyPoker Regular Tournament, Big Blind is t40 (7 handed) Converter on pregopoker.com

No reads. When I saw the flop I instantly felt he had a set. However, this being a sunday afternoon tourney, hes probably just a donk.
UTG (t2695)
Hero (t2960)
MP1 (t2960)
CO (t8000)
Button (t2800)
SB (t2960)
BB (t7625)

Preflop: Hero is in UTG+1 with A[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/club.gif[/img]
<font color="gray">UTG folds</font>, <font color="red">Hero raises to t200</font>, <font color="gray">MP1 folds</font>, <font color="gray">CO folds</font>, <font color="gray">Button folds</font>, <font color="gray">SB folds</font>, BB calls t160

Flop: (t360) 6[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/club.gif[/img] (2 players)
BB checks, <font color="red">Hero bets t300</font>, <font color="red">BB raises to t600</font>

Hero?