NL50 : AA facing minrase

[doodydota]

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($50)
Hero ($160.05)
CO ($49.25)
Button ($62.50) <font color="blue">38/34/5 - 80 hands </font>
SB ($17.75)
BB ($15.55)

Preflop: Hero is MP with A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img].
UTG calls $0.50, <font color="#CC3333">Hero raises to $2.5</font>, <font color="#666666">1 fold</font>, Button calls $2.50, <font color="#666666">2 folds</font>, UTG calls $2.

Flop: ($8.25) 7[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">Hero bets $7</font>, <font color="#CC3333">Button raises to $15</font>, UTG folds, <font color="#CC3333">Hero ????</font>


Is this a set? Should I call or raise here? Anyone folds here?