no reads yet. is this a call with an A to trap an extra bet on the turn, or more of a bluff usually?

Party Poker 0.50/1.00 Hold'em <font color="#0000FF">(6 handed)</font> link

Preflop: Hero is MP with K[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">2 folds</font>, SB calls, BB calls.

Flop: (6.00 SB) A[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets</font>, SB folds, BB calls.

Turn: (4.00 BB) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, Hero folds.

Final Pot: 5.00 BB.