[Andy B]

I think the third-street raise is pretty automatic. The other guy's raise on fourth street probably means two pair or a pocket pair larger than Eights. On fifth, there are two Eights, three Aces, a King, and runner-runner clubs which will give you a likely winner. I think you have enough hand to call on fifth. You might even consider betting or check-raising as a semi-bluff, depending on whether the other guy is capable of laying down a hand. On the river, the pot's small enough that even I probably wouldn't try to catch a bluff.