A7 top pair on flop faces raise on river

[PleasureGuy69]

No reads on villain.

What's the best river play here? Should I bet/fold, bet looking to get all in, or check call?

Full Tilt Poker - No Limit Hold'em Cash Game - $0.25/$0.50 Blinds - 6 Players - (LegoPoker HH Converter)

Hero (SB): $65.20
BB: $55.75
UTG: $32.25
MP: $81.25
CO: $50.00
BTN: $18.90

Preflop: Hero is dealt 7[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/heart.gif[/img] (6 Players)
4 folds, <font color="red">Hero raises to $2.00</font>, BB calls $1.50

Flop: ($4) J[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $2.75</font>, BB calls $2.75

Turn: ($9.50) Q[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $7.00</font>, BB calls $7.00

River: ($23.50) 5[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $16.50</font>, <font color="red">BB raises all-in to $44.00</font>, Hero ???