(PS $55) Top pair on monotone flop?

[bluesbassman]

Villain was kinda loose, so I figured AJs should be good against his range here. Not sure how to play this flop...

PokerStars Tournament, Big Blind is t50 (9 handed) Converter on pregopoker.com

UTG (t1450)
UTG+1 (t2605)
MP1 (t1110)
MP2 (t1165)
Hero (t1379)
CO (t1240)
Button (t882)
SB (t955)
BB (t2714)

Preflop: Hero is in MP3 with A[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/spade.gif[/img]
<font color="gray">UTG folds</font>, <font color="gray">UTG+1 folds</font>, <font color="red">MP1 raises to t150</font>, <font color="gray">MP2 folds</font>, Hero calls t150, <font color="gray">CO folds</font>, <font color="gray">Button folds</font>, <font color="gray">SB folds</font>, <font color="gray">BB folds</font>

Flop: (t375) A[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/diamond.gif[/img] (2 players)
<font color="red">MP1 bets t150</font>, Hero ??