top set on scary board (50NL 6 max)

[rachelwxm]

Hi, this is from party poker 6max 50NL a while back. Blinds are .25/.5, stack size $50.

I was dealt 55 UTG and I limped, one guy limped and button raised to $2.5, we both called. The flop was 543 all same suit, I bet pot $7 and limper pushed all in, button folded.

Who calls here? No reads.

Thanks for the response.