I´m totally lost in these spots. I´ve been playing tight, CO runs 30/12/3.6. It´s hard for me to represent a Q, but I hate to play c/ or b/f on flop.

$0.5/$1 No Limit Holdem
6 players
Converted at weaktight.com

Stacks:
UTG ($135.84)
UTG+1 ($84.38)
CO ($174.91)
BTN ($342.74)
Hero ($172.45)
BB ($110.85)

Pre-flop: ($1.5, 6 players) Hero is SB
2 folds, CO raises to $4, 1 fold, Hero raises to $15, 1 fold, CO calls $11

Flop: ($31, 2 players)
Hero ($157.45)?