game is 1-2 nl:
i have about $120 to start the hand
5 way raise pot to $10.
Im in early pos with A4 suited, flop comes A48 w/ 2 hearts.
Sb inital raiser checks next guy checks, i make pot sized $25 bet and get called by loose button player w/ over $400.
turn card comes an 8.

WHAT DO YOU DO?

OPTIONS:
1.medium sized bet- tester bet to see if ur still good even tho your flopped 2 pair just got counterfited. if he raises you strongly consider folding, because you are quite sure hes happy with his A10 A9 HAND.
2.Large bet- bet big hoping hes on a pure flush draw
3.check- see what he does and reassess the situation.