1/2 Flush river decision

Hero (stack 700) is on the BTN with 4s 5s

UTG limps, HJ limps, Hero raised to 10, SB folds, BB calls, HJ folds, CO calls

Flop: Ac 6c 7s (Pot 33)

BB bets 20, CO calls, Hero calls

Turn: Ac 6c 7s 3s (Pot 93)

BB bets 40, CO calls, Hero raises 100, BB calls, CO folds

River: Ac 6c 7s 3d Js (Pot 333)

BB shoved all-in 250, Hero?

Is this a fold or a call?