Party Super Tuesday, 99 overpair faces potbet in position

[rubenrtv]

New to this table. No info on villains. I have been playing very tight.

What is my line?

***** Hand History for Game 6357594489 *****
NL Texas Hold'em Trny: 35737143 Level: 2 Blinds(30/60) - Tuesday, September 25, 15:32:13 ET 2007
Table Super Tuesday (1158548) Table #2 (Real Money)
Seat 10 is the button
Total number of players : 10
Seat 1: ollio111 ( 7,335 )
Seat 2: julece ( 1,900 )
Seat 3: Crazyahmed1 ( 2,120 )
Seat 4: Bambino75 ( 2,650 )
Seat 5: guravushka ( 6,880 )
Seat 6: roxymusic13 ( 4,950 )
Seat 7: LGWWES ( 3,150 )
Seat 8: sieuwping ( 1,890 )
Seat 9: rubenrtv2 ( 3,375 )
Seat 10: faxaa ( 5,887 )
Trny: 35737143 Level: 2
Blinds(30/60)
** Dealing down cards **
Dealt to rubenrtv2 [ 9h 9c ]
Crazyahmed1 folds
Bambino75 folds
guravushka folds
roxymusic13 raises [180]
LGWWES folds
sieuwping folds
rubenrtv2 calls [180]
faxaa folds
ollio111 folds
julece calls [120]
** Dealing Flop ** [ 7s, 5s, 4d ]
julece checks
roxymusic13 bets [600]
rubenrtv2 ?