Who 3-bets the turn here?

[ode]

Party Poker 2/4 Hold'em (10 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Preflop: Hero is Button with Q/images/graemlins/spade.gif, Q/images/graemlins/diamond.gif.
UTG calls, <font color="#666666">3 folds</font>, MP2 calls, <font color="#666666">1 fold</font>, CO calls, <font color="#CC3333">Hero raises</font>, SB calls, BB calls, UTG calls, MP2 calls, CO calls.

Flop: (12 SB) K/images/graemlins/spade.gif, 2/images/graemlins/heart.gif, Q/images/graemlins/club.gif <font color="#0000FF">(6 players)</font>
SB checks, <font color="#CC3333">BB bets</font>, UTG folds, MP2 calls, CO calls, <font color="#CC3333">Hero raises</font>, SB calls, BB calls, MP2 calls, CO calls.

Turn: (11 BB) A/images/graemlins/diamond.gif <font color="#0000FF">(5 players)</font>
SB checks, BB checks, <font color="#CC3333">MP2 bets</font>, <font color="#CC3333">CO raises</font>, Hero calls, SB folds, BB calls, MP2 calls.

River: (19 BB) 2/images/graemlins/club.gif <font color="#0000FF">(4 players)</font>
BB checks, MP2 checks, <font color="#CC3333">CO bets</font>, <font color="#CC3333">Hero raises</font>, BB calls, MP2 calls, CO calls.

Final Pot: 27 BB


So, does someone 3-bet the turn and why?

/ode

[MoreWineII]

Yes, because I've probably got the best hand.

[shark6]

3-bet turn. You need to make hay when the sun is shining. You likely have the best hand. Even if there is a straight out there, you have outs to full house.

[mannika]

First of all, to get better answers in the future, don't show the rest of the turn action or the river action.

In terms of strategy, unless your opponents are very tricky/stupid, the only thing you're behind here is JT. I don't think you can necessarily give credit for this hand yet, and therefore I like 3-betting on the turn. If you are capped or bet into again on the river, call unless the board pairs, in which case you can go into bet-maximizing mode.