PokerStars No-Limit Hold'em, $1.00 BB (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($161.05)
SB ($143.50)
BB ($20.05)
UTG ($149)
UTG+1 ($90.05)
Hero ($102)
MP2 ($51.70)
CO ($117.60)

Preflop: Hero is MP1 with J, J. CO posts a blind of $1.50.
UTG raises to $4, 1 fold, Hero ???

---

Villian is an unknown.

What's your move here PF?