Two pairs on board, AI vs me?

[Restlys]

How likely is this a simple A high bluff bet? Opairs would raise in my head, but im so not sure cuz NL 10 is so full of loose passive players ..

PokerStars No-Limit Hold'em, $0.10 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

SB ($5.85)
BB ($3.80)
UTG ($6.45)
MP ($8.80)
Hero ($10.05)
Button ($2.20)

Preflop: Hero is CO with A[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $0.4</font>, <font color="#666666">1 fold</font>, SB calls $0.35, <font color="#666666">1 fold</font>.

Flop: ($0.90) 5[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $0.6</font>, SB calls $0.60.

Turn: ($2.10) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $1.6</font>, SB calls $1.60.

River: ($5.30) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $3.25 (All-In)</font>, Hero folds.

Final Pot: $8.55