NL25, TPTK faced AI on the river

[pacman2k7]

Villain is unknown, just sat down to the table.

I can beat here mid pairs, QK, QJ or busted FD which is unlikely

Should I put him on 2pair or backdoor straight?

Poker Stars - No Limit Hold'em Cash Game - $0.10/$0.25 Blinds - 5 Players - (LegoPoker HH Converter)

SB: $21.50
Hero (BB): $25.00
UTG: $39.60
CO: $41.10
BTN: $39.20

Preflop: Hero is dealt Q[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/club.gif[/img] (5 Players)
UTG calls $0.25, 2 folds, SB calls $0.15, <font color="red">Hero raises to $1.25</font>, UTG calls $1.00, SB calls $1.00

Flop: ($3.75) 2[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/heart.gif[/img] (3 Players)
SB checks, <font color="red">Hero bets $2.75</font>, UTG folds, SB calls $2.75

Turn: ($9.25) 8[img]/images/graemlins/spade.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $6.50</font>, SB calls $6.50

River: ($22.25) T[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">SB bets all-in for $11.00</font>, Hero??