TPWK river call?

[z28dreams]

Full Tilt Poker, $0.10/$0.25 NL Hold'em Cash Game, 3 Players
LeggoPoker.com - Hand History Converter

BB: $10
BTN: $5.60
Hero (SB): $41

Pre-Flop: 9[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/diamond.gif[/img] dealt to Hero (SB)
BTN calls $0.25, Hero calls $0.15, BB checks

Flop: ($0.75) 5[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/spade.gif[/img] (3 Players)
<font color="red">Hero bets $0.75</font>, BB calls $0.75, BTN folds

Turn: ($2.25) K[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $1.50</font>, BB calls $1.50

River: ($5.25) 7[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">BB bets $5.25</font>, Hero ???

Villain is new to the table and has played maybe 8 hands, but he's been involved in most of them. My guess is he's on the loose side.

Do you fold this river? Do you prefer a b/f over a check?