

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 UTG, and your holding is [Six of Heart and Six of Diamond].
Before the flop, UTG raise 2.0 chips, and BB call. Assume that all other players that is not mentioned folded.
The flop comes Queen Of Club, Ace Of Diamond, and King Of Heart, then BB check, UTG bet 3 chips, and BB call.
The turn comes Ten Of Spade, then BB check, UTG bet 13 chips, BB raise 37 chips, and UTG call.
The river comes Ten Of Club, then BB check.
You currently have Two Pair(Two Pair, Tens and Sixs with Ace kicker).

Now it is your turn to make a move.
To remind you, the current pot size is 81.0 chips, and your holding is [Six of Heart and Six of Diamond]. You currently have Two 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: