Villain was new to me, 30 hands, VPIP 25%, hadn't raised PF and hadn't shown a hand

Ultimate Bet No-Limit Hold'em, $.50 BB (9 handed)

BB ($44.25)
UTG ($41.80)
Hero ($53)
MP1 ($55.80)
MP2 ($113.10)
MP3 ($25.10)
CO ($93.25)
Button ($22.65)
SB ($47.85)

Preflop: Hero is UTG+1 with , .
Hero raises to $2.25, 5 folds, SB calls $2, Call calls $2.

Flop: ($7) , , (4 players)
SB checks, Hero bets $4.5, SB pushes $45.50, Hero ?

Struggling to work this one out, AJ is the obvious but a push seems far too much. Is he putting me to the test with KK, QQ. Most would re-raise PF with KK so QQ more likely of the 2. Is he drawing with JJ? AQh, QJh? I'm winning more than I'm losing but still don't like it.

I wouldve bet pot on the flop, but Im still calling here.

Thanks for comments.

I called and he had QQ

it adds variance but I think you have to call. How many people would push that flop with AJ? Not many. KK would probably reraise preflop, perhaps QQ too so I fear something more like Axh for gusthot and flush draw and a little QQ. Also, people coulld have KQ here or KJ, QJ, ect to make this a call.

I hate variance more than anyone, but you cant fold every time someone goes all in. There are an aweful lot of hands that he would make this move with and you are ahead of most of them. Actually you way ahead of about half of them and far enough ahead of the others that I m not folding.

The only 2 hands that have you crushed are KK and QQ.

He could have AA, JJ, or any 2 broadway cards which is alot of combinations. He could have ONLY a flush draw also.

I see people frequently make villains play with A[h] X[h]. They have the nut flush and a gutshot. They push for fold equity. Or heck they push because people LOVE to push with the nut flush draw.

Usually a push like these is a medium strong hand. You have a very strong hand. I call