A7s with nut-flush draw, but their going all-in

[bober2]

Should I call or fold to the the all-in?

PokerStars No-Limit Hold'em, $0.02 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($1.48)
SB ($1.02)
Hero ($8.21)
UTG ($3.66)
MP ($2.05)
CO ($7.53)

Preflop: Hero is BB with 7[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">UTG raises to $0.06</font>, MP calls $0.06, CO calls $0.06, <font color="#666666">1 fold</font>, SB calls $0.05, Hero calls $0.04.

Flop: ($0.30) 9[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, <font color="#CC3333">Hero bets $0.3</font>, UTG calls $0.30, <font color="#CC3333">MP raises to $0.8</font>, CO folds, SB folds, Hero calls $0.50, <font color="#CC3333">UTG raises to $3.6</font>, MP calls $1.19 (All-In), Hero (???)