A4s

I think it's a good fold. You open from MP so his 3betting range is something like A9+ KQ QT + pockets and maybe something like 98s if he ever do this, reads needed. So you are behind against all of this and you dont have enough outs to call.

Your opponent is getting 1 into a total pot of 8.5 to attempt to take the pot off you so if looking at this from a maths perspective you should be folding about 12% of your range

However our range is very strong and full of backdoor draws which, along with our A-high may lead us to peel very light here.

I would prefer to fold K8, K9 with no backdoor FD, A2/A3 with the same, T9 with no BDFD, but that only comes to about 7% of our total hands which isn't a lot so you can probably get away with folding this without being exploited but I'd probably see 1 more just for backdoor outs and the possibility I'm ahead.

I could honestly see peeling/raising our whole range on this board from the HJ and playing the turn accordingly.