PokerStars No-Limit Hold'em, $1.00 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($54.25)
Hero ($151.30)
SB ($125)
BB ($58.15)
UTG ($35)
UTG+1 ($73.15)
MP1 ($75.15)
MP2 ($100)
MP3 ($89.15)

Preflop: Hero is Button with Q, A.
1 fold, UTG+1 calls $1, MP1 calls $1, 2 folds, CO calls $1, Hero raises to $7, 2 folds, UTG+1 calls $6, MP1 calls $6, CO folds.

Flop: ($23.50) Q, 5, 6 (3 players)
UTG+1 checks, MP1 checks, Hero bets $17, UTG+1 calls $17, MP1 folds.

Turn: ($57.50) 2 (2 players)
UTG+1 bets $25, Hero ???

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Villian was an unknown, he had just joined the table.

What's your move here?