my river flush gets raised

[Big Folder]

live 3/6. This is probably real straightfoward, but I wanted to check.

UTG is total fish. He only gets aggressive when he raises preflop. Otherwise, its call down time. He also has the hugest chipstack in front of him ever. Must have been his night. Everyone else is loose passive.

I have J [img]/images/graemlins/diamond.gif[/img] 7 [img]/images/graemlins/diamond.gif[/img] in the BB. 5 limpers, small blind completes. I check.

Flop is Q[img]/images/graemlins/spade.gif[/img] T [img]/images/graemlins/diamond.gif[/img] 8 [img]/images/graemlins/diamond.gif[/img]. <font color="red">Hero bets.</font> 3 callers.

Turn is 6[img]/images/graemlins/club.gif[/img]. I check. Check around.

River is 5 [img]/images/graemlins/diamond.gif[/img].

<font color="red">Hero bet.</font> <font color="red">Normally silent UTG says "raise".</font> Coldcall. Fold. Hero calls/raises???