AA preflop Raiser, Hero?

[Madrugada]

CO: ultra tight, reasonable
MP1: fishy callingstation, VPIP 90%

I'm sure CO raising with AA. I'll see the flop. CO c-pots flop.

Pot Limit Omaha Ring game
Blinds: $0.25/$0.5
10 players
Converter

Stack sizes:
UTG: $9.5
UTG+1: $35.25
UTG+2: $9.2
MP1: $103.7
Hero: $26.95
MP3: $45
CO: $50
Button: $49.15
SB: $44.25
BB: $30

Pre-flop: (10 players) Hero is MP2 with 7[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/club.gif[/img]
2 folds, UTG+2 calls, MP1 calls, Hero calls, MP3 calls, <font color="#cc0000">CO raises to $3.75</font>, 4 folds, MP1 calls, Hero calls, MP3 calls.

Flop: 5[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/spade.gif[/img] ($16.25, 4 players)
MP1 checks, Hero checks, MP3 checks, <font color="#cc0000">CO bets $16.25</font>, MP1 calls, Hero?