[Rizen]

FWIW I check this flop and see how the action develops behind me with 5 players in the hand. Betting out these kind of flops with a weak Ace is a way to lose A LOT of chips IMO. Depending on how the action unfolds after me I either raise or fold the flop (I don't like flat calling here at all) and if I get to the turn I certainly like this card. Bet out and call the raise.

The river most likely doesn't change the situation for you at all (he's not playing 23 or 44 like this is he?). If he raised you on the turn, he's probably raising you on the river if you bet out, so I check/call down here hoping for a cheap showdown.

-Rizen