PokerStars No-Limit Hold'em, $0.50 BB (3 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($61.80)
SB ($24.40)
Hero ($66.10)

Preflop: Hero is BB with A, T.
Button calls $0.50, SB completes, Hero checks.

Flop: ($1.50) 6, 9, T (3 players)
SB checks, Hero bets $1.25, Button calls $1.25, SB raises to $5, Hero ???

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Villian is 55/16/1 over about 60 hands.

What's your play here and why?