

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 CO, and your holding is [King of Heart and Two of Heart].
Before the flop, CO raise 2.3 chips, and BB call. Assume that all other players that is not mentioned folded.
The flop comes Seven Of Diamond, Six Of Club, and Four Of Heart, then BB check, and CO check.
The turn comes Queen Of Spade, then BB bet 4 chips, and CO call.
The river comes Seven Of Club, then BB check.
You currently have One Pair(One Pair, Sevens with King, Queen, Six kickers).

Now it is your turn to make a move.
To remind you, the current pot size is 13.0 chips, and your holding is [King of Heart and Two of Heart]. 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: