

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 SB, and your holding is [Eight of Spade and Seven of Spade].
You currently have High Card(Eight-high).
Before the flop, BTN raise 2.5. Assume that all other players that is not mentioned folded.

Now it is your turn to make a move.
To remind you, the current pot size is 4.0 chips, and your holding is [Eight of Spade and Seven of Spade].

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: