PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($58.60)
MP ($17.15)
Hero ($50)
Button ($75.25)
SB ($50.25)
BB ($65.65)

Preflop: Hero is CO with A, Q.
2 folds, Hero raises to $2, Button calls $2, 2 folds.

Flop: ($4.75) Q, 3, 7 (2 players)
Hero bets $3.5, Button calls $3.50.

Turn: ($11.75) 7 (2 players)
Hero bets $9, Button raises to $18, Hero ???

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All I know about Villian is that he is about 35/7/1 over an insignificant 24 hands.

What's your turn play here and why?