$50 HUSNG -- Top Pair, Strange Spot

[Nichomacheo]

I agree that vs a standard player a call and re-eval on the turn would be best. The problem, and the reason I posted this, is that my opponent likes to slow play hands, so what is he raising with here? I think A9 and A7 slow play, which leaves the possible 97 plus T8, 86 maybe. I had a hard time putting him on a hand because I know he is passive with good hands.