So rare it probably doesn't matter, but how do you play this river?

[NateDog]

Hero is MP with K [img]/images/graemlins/spade.gif[/img] J [img]/images/graemlins/diamond.gif[/img]

Hero opens, Button 3 bets, BB calls, Hero calls

Flop: K [img]/images/graemlins/heart.gif[/img] K [img]/images/graemlins/club.gif[/img] Q [img]/images/graemlins/spade.gif[/img]

Hero bets, Button raises, BB folds, Hero calls

Turn: J [img]/images/graemlins/club.gif[/img]

Hero bets, Button raises, Hero 3 bets, button calls

River : A [img]/images/graemlins/diamond.gif[/img]

c/c or bet/fold?