No reads on villian

Party Poker No-Limit Hold'em, $ BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Hero ($94.70)
CO ($11)
Button ($33.15)
SB ($59.80)
BB ($50.95)
UTG ($25.95)
UTG+1 ($21.55)
MP1 ($61.80)

Preflop: Hero is MP2 with A, A. SB posts a blind of $0.25.
3 folds, Hero raises to $2, CO calls $2, 2 folds, BB calls $1.50.

Flop: ($6.25) 3, 5, 7 (3 players)
BB checks, Hero bets $5, CO folds, BB calls $5.

Turn: ($16.25) 9 (2 players)
BB bets $5, Hero ?