$1/2 FRLH. I do not have good reads on either of the other players in this hand.
Pre-flop: (
9 players) Hero is SB with
UTG calls,
4 folds, CO (poster) checks, Button folds, Hero calls, BB (poster) checks.
Flop:

(
4SB, 4 players)
Hero bets, BB calls,
UTG raises, CO folds, Hero calls, BB calls.
Turn: 
(
5BB, 3 players)
Hero checks, BB checks,
UTG bets, Hero ?
What do you think about 3-betting the flop?