NL10 - 99 facing small donkbet on monotone flop.

[Psyzoid]

Poker Stars, $0.05/$0.10 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

Hero (BTN): $9.60
SB: $14.20
BB: $6.35
UTG: $4.85
MP: $11.90
CO: $24

UTG posts $0.10
Pre-Flop: 9[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] dealt to Hero (BTN)
UTG checks, MP calls $0.10, CO calls $0.10, <font color="red">Hero raises to $0.70</font>, SB folds, BB calls $0.60, 2 folds, CO calls $0.60

Flop: ($2.35) 2[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/club.gif[/img] (3 Players)
BB checks, <font color="red">CO bets $0.50</font>, Hero ?

How do we continue?

Just sat down so no stats or reads.