Unimproved AQo Vs. Lead

Don't know my opponent. What is your standard/default line here?

PokerStars No-Limit Hold'em, $10 BB (9 handed)

CO ($201)
Button ($1519.10)
SB ($410)
BB ($1232)
UTG ($896.50)
UTG+1 ($1222.65)
MP1 ($970)
MP2 ($390)
Hero ($1020)

Preflop: Hero is MP3 with A[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">4 folds</font>, <font color="#CC3333">Hero raises to $40</font>, <font color="#666666">3 folds</font>, BB calls $30.

Flop: ($85) 9[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $50</font>