

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 [Ace of Spade and Nine of Spade].
Before the flop, HJ raise 2.0 chips, CO raise 6.5 chips, and HJ call. Assume that all other players that is not mentioned folded.
The flop comes Nine Of Diamond, Ten Of Spade, and Eight Of Spade, then HJ check, CO bet 7 chips, HJ raise 16 chips, and CO call.
The turn comes Jack Of Heart, then HJ check.
You currently have One Pair(One Pair, Nines with Ace, Jack, Ten kickers).

Now it is your turn to make a move.
To remind you, the current pot size is 46.0 chips, and your holding is [Ace of Spade and Nine of Spade]. 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: