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

MP ($100.45)
CO ($117.10)
Button ($49.35)
SB ($100.85)
Hero ($100)
UTG ($61.55)

Preflop: Hero is BB with A, Q.
1 fold, MP raises to $4, 3 folds, Hero raises to $14, MP calls $10.

Flop: ($28.50) A, 2, K (2 players)
Hero ???

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Against an unknown, what is a good flop line here?