slightly common situation (from a debate)

[oreogod]

5 handed table. I open raise otb w/ 99. sb calls, bb calls.

Flop: A67r.

sb bets, bb folds. What do u do here and why? Im keeping the situation readless because that way u can tell me what u do against a good player, a lag, and a donk. My usual options here are raise or call which is obviously where the debate lies. Do u raise and go for a cheap showdown strategy or call down, or call and raise turn, or call and fold turn, etc.