Holdem No Limit - $0.5 BB

CO ($144.73) [Hero]
Button ($90.32)
SB ($99.50)
BB ($27.69)
UTG ($25)
MP ($101.17)

Hero is CO with A, A
Preflop: (5 players, $0.75)
MP calls $0.50, Hero calls $0.50 and raises $2, 3 folds, MP calls $2

Flop: 2, 3, T (2 players, $5.75)
MP bets $5, Hero ???

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Villian is 19/3/4 over 40 hands.

What's your move here?