

You are a specialist in playing 6-handed No Limit Texas Holdem. The following will be a game scenario and you need to make the optimal decision.

Here is a game summary:

The small blind is 0.5 chips and the big blind is 1 chips. Everyone started with 100 chips.
The player positions involved in this game are UTG, HJ, CO, BTN, SB, BB.
In this hand, your position is BTN, and your holding is [Six of Heart and Six of Diamond].
Before the flop, UTG raise 2.0 chips, and BTN call. Assume that all other players that is not mentioned folded.
The flop comes Jack Of Heart, Four Of Heart, and Five Of Spade, then UTG check, and BTN check.
The turn comes King Of Heart, then UTG check, BTN bet 6 chips, UTG raise 17 chips, and BTN call.
The river comes Eight Of Diamond, then UTG check, BTN bet 29 chips, and UTG raise 81 chips.
You currently have One Pair(One Pair, Sixs with King, Jack, Eight kickers).

Now it is your turn to make a move.
To remind you, the current pot size is 149.0 chips, and your holding is [Six of Heart and Six of Diamond]. You currently have One Pair.

Decide on an action based on the strength of your hand on this board, your position, and actions before you. Do not explain your answer.
Your optimal action is: