200nl JJ facing big raise on undercard flop

[pokerfan]

villain was a tight player with stats like 13.8/10.3/3(flop aggression).
PokerStars No-Limit Hold'em, $2 BB (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

SB ($171.90)
BB ($198)
Hero ($215.65)
MP ($190)
CO ($286.45)
Button ($300)

Preflop: Hero is UTG with J, J.
Hero raises to $7, 1 fold, CO calls $7, 3 folds.

Flop: ($17) 2, 3, 4 (2 players)
Hero bets $12, CO raises to $40, Hero ??

[Renton]

i would fold because you are under the gun.

[pokerfan]

really?? Why not put lots of pockets on his range like 55+?

i would fold because you are under the gun.