SB is tight about 11/7 over 200 hands. Not really worried about BB.

PokerStars No-Limit Hold'em, $0.50 BB (8 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($35.95)
Button ($7.45)
SB ($51.45)
BB ($10)
Hero ($55.70)
UTG+1 ($48.95)
MP1 ($10.95)
MP2 ($38.45)

Preflop: Hero is UTG with A, Q.
Hero raises to $2, 5 folds, SB calls $1.75, BB calls $1.50.

Flop: ($6) 7, Q, 9 (3 players)
SB bets $3, BB calls $3, Hero raises to $10, SB calls $7, BB calls $5 (All-In).

Turn: ($-48.90) A (3 players, 1 all-in)
SB checks, Hero bets $16.5, SB raises to $39.45, Hero ??