NL$50 2-pair facing allin bet on river

[antzzor]

Hi guys
Cant figure this one out

Sat down recently, havent seen villain do anything crazy other then that no reads.

Full Tilt No-Limit Hold'em, $0.50 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($52.60)
UTG+1 ($18.95)
Hero ($88.60)
MP2 ($35.50)
CO ($9.25)
Button ($50.65)
SB ($8.75)
BB ($50.90)

Preflop: Hero is MP1 with A[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">UTG raises to $1</font>, <font color="#666666">1 fold</font>, Hero calls $1, <font color="#666666">4 folds</font>, BB calls $0.50.

Flop: ($3.25) J[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">UTG bets $2</font>, <font color="#CC3333">Hero raises to $5</font>, BB folds, UTG calls $3.

Raised to take control in the hand should have raised a little more though perhaps.

Turn: ($13.25) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $5</font>, <font color="#CC3333">UTG raises to $15</font>, Hero calls $10.

River: ($43.25) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets $31.6 (All-In)</font>, Hero???

feels like I have to call, but given the board and his betting i cant put him on much else then a set.