Of course 99s
I think my opponent would be shocked, it would just be a nervous breakdown
...... and probably not only he would have a nervous breakdown
Among those options, I think I'll go with JTs
Its hard, but you have the possibility of hitting something strong enough to beat AA. The options you have are much less limited than with, for example, KK.
Experience shows me that a pair formed pre-flop is always a strong hand.
If I knew that my rival had AA preflop I would fold even if I only had 1/2 BB left to continue.
But being forced to go, I preferred to go with another partner.
But I would choose 99s and before the dealer dealt the community cards, I would call the tournament organization and the hand would be canceled for having two identical cards in the deck.