5/10 NL

Hero is on the button with AK...abour 520 behind.

UTG raises to 40 with 1100 behind. I am normally a tourney player but am trying to make the move to NL cash games and this hand had me confused a little bit.

UTG raises to 40
Hero calls.

FLOP---- 8 8 6

UTG bets 50, hero calls.

TURN----- K, UTG bets 75, hero raises to 200


UTG re-raises for my last 223....HERO does what??