Top two-pair facing a raise and reraise......

[sp1ke36]

Cash game 300max/100min 5/2 blinds.
I have A5 on the button.
CUT-OFF-1(2000) limps
CUT-OFF(450) limps
BUTTON(ME)(600) limps
SB folds(300)
BB checks(300)

FLOP comes A 5 4 rainbow

BB checks
CO-1 raises makes it $25.(He is a strong solid player)
CO seat raises to $100 (from what i've seen he's played pretty solid)

I have top two pair and I lay it down here.
Bad move?
Should I have at least called or at least raised to see where I'm at.

The cutoff later showed second two pair 5's and 4's.
I had him for a set. Am I seeing monsters under the bed?