

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 BB, and your holding is [Ace of Heart and Nine 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 Ten Of Heart, Four Of Club, and Five Of Diamond, then BB check, CO bet 4 chips, and BB call.
The turn comes Seven Of Spade, then BB check, CO bet 10 chips, and BB call.
The river comes Ace Of Spade, then BB bet 17 chips, and CO raise 83 chips.
You currently have One Pair(One Pair, Aces with Ten, Nine, Seven kickers).

Now it is your turn to make a move.
To remind you, the current pot size is 129.0 chips, and your holding is [Ace of Heart and Nine 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: