I would call the turn. I suspect you are probably ahead here, but the thing is you are either a huge favorite at this point or a huge underdog, plus you have position. I think villian most likely has some vaunerable overpair like TT or JJ, or even a slowplayed KK or QQ. There are no threatening draws out there, so no need to "protect" your hand. Call and see what he does on the river. I would call any reasonable bet ($15-20), and if he checks fire a value bet. If he has 55 he played the hand well. Unless villian is known to be a super donk, calling the turn here is standard for me.