$1/$2 NL: TPGK and I get raised. What's the standard line?

[AA suited]

Party Poker No-Limit Hold'em, $ Hero (10 handed) FTR converter on zerodivide.cx

MP3 ($163.50)
CO ($50.20)
Button ($55.65)
SB ($72.05)
Hero ($40.95)
UTG ($49.50)
UTG+1 ($35.77)
UTG+2 ($46.75)
MP1 ($23.50)
MP2 ($48.20)

Preflop: Hero is BB with J[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $0.25.
UTG+1 raises to $1</font>, UTG+2 calls $1, MP3 calls $1, CO calls $1, Hero calls $0.50.

Flop: ($5.25) K[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img] (5 players)</font>
Hero bets $4, UTG+1 raises to $10, rest folds, Hero ???

No reads.

preflop raise could mean Ax suited. or KQ.

i'm thinking he might be raising to buy a free turn card for a flush draw.

but then again he might also have 2 pair with KQ.

What's the standard line?