Villain is 43/11 over 50-ish hands.

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
6 players
Converter

Stack sizes:
UTG: $82.10
UTG+1: $137.20
Hero: $165.30
Button: $147.55
SB: $83.35
BB: $106.65

Pre-flop: (6 players) Hero is CO with A 2
2 folds, Hero calls, Button raises to $4.5, SB calls, BB calls, Hero calls.

Flop: 7 9 4 ($18, 4 players)
SB bets $18, BB folds, Hero ???