5-10 Live flopped Bottom set

Hero is SB and is playing a game he usually doesn't. I'm a limit player.

I'm the SB with 4-4.

UTG raises to $40

Two calls, Button calls, Hero calls, BB folds.



Flop is

4 5 6, rainbow if i remember correctly

I check, UTG bets $100

MP caller folds,

MP caller number two raises, minimum raise, makes it $200 to go.

Button smooth calls.

Hero......????