PokerStars No-Limit Hold'em, $1.00 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($45.90)
UTG ($121)
MP ($261.50)
Hero ($102.50)
Button ($112.25)
SB ($69.80)

Preflop: Hero is CO with 7, A.
2 folds, Hero raises to $3.5, Button calls $3.50, 1 fold, BB calls $2.50.

Flop: ($11) A, 5, A (3 players)
BB checks, Hero bets $9.5, Button raises to $19, BB folds, Hero ???

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What's your standard flop line here, and plan for the turn?