Top pair SB hand

[brizzypare]

Party Poker No-Limit Hold'em Tourney, Big Blind is t30 (6 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Hero (t745)
BB (t770)
UTG (t1130)
MP (t465)
CO (t3875)
Button (t1015)

Preflop: Hero is SB with Q/images/graemlins/diamond.gif, 8/images/graemlins/diamond.gif.
<font color="#666666">2 folds</font>, CO calls t30, <font color="#666666">1 fold</font>, Hero completes, BB checks.

Flop: (t90) 5/images/graemlins/spade.gif, 9/images/graemlins/diamond.gif, Q/images/graemlins/heart.gif <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets t90</font>, <font color="#CC3333">BB raises to t180</font>, CO folds, Hero ????

I had no idea what to do here. I have zero read on this guy. Fold? Call? Push?

[curtains]

I fold after the flop min raise.