KT - flop TP, turn 2-pair.... facing a min-raise

[orig!naL]

Villain is 44/9/.6

At first I was happy when I hit my 2-pair. When I got min-raised I really started wondering what I beat here. I doubt villain has a set so all I can think of is some weird 2-pair or the straight.

Thoughts? Do you call the min-bet? (If you do call, what is your river action?) Or, do you fold to this min-raise and move on?

Full Tilt Poker - No Limit Hold'em Cash Game - $0.10/$0.25 Blinds - 5 Players - (LegoPoker Hand History Converter)

SB: $26.30
Hero (BB): $26.50
UTG: $28.65
CO: $25.00
BTN: $8.85

Preflop: Hero is dealt (5 Players)
UTG calls $0.25, 2 folds, SB calls $0.15, Hero checks

Flop: ($0.75) (3 Players)
SB checks, <font color="red">Hero bets $0.75</font>, UTG calls $0.75, SB folds

Turn: ($2.25) (2 Players)
<font color="red">Hero bets $2.00</font>, <font color="red">UTG raises to $4.00</font>...