Live 10-handed; .25/.50 NL

[Shibby]

Hero is UTG+1 with ~$70 behind and A [img]/images/graemlins/spade.gif[/img] 10 [img]/images/graemlins/club.gif[/img].

UTG folds, Hero limps, couple of limpers trail in and the BB checks his option.

Pot: ~$2.50

Flop is 4 [img]/images/graemlins/spade.gif[/img] 7 [img]/images/graemlins/spade.gif[/img] 10 [img]/images/graemlins/spade.gif[/img]

SB (villain) leads out for $3, BB folds, Hero calls, folds around.

Pot: ~$8.50

Turn is an A [img]/images/graemlins/heart.gif[/img]

Villain leads for $5, Hero raises to $15, Villain raises to $35, Hero...?

The SB is a reasonably tight/aggressive player, but the SB and the unraised pot make it so that I can't with 100% certainty put him on a hand, but I'm reasonably sure that he flopped a flush, or a set...what's my action?