

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 Seven of Heart].
Before the flop, CO raise 2.3 chips, and BTN call. Assume that all other players that is not mentioned folded.
The flop comes Queen Of Club, Eight Of Club, and Ace Of Club, then CO check, BTN bet 2 chips, and CO call.
The turn comes Three Of Club, then CO check, BTN bet 8 chips, and CO call.
The river comes Queen Of Heart, then CO bet 13 chips, and BTN raise 47 chips.
You currently have One Pair(One Pair, Queens with Ace, King, Eight kickers).

Now it is your turn to make a move.
To remind you, the current pot size is 84.0 chips, and your holding is [King of Heart and Seven 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: