Would you call this check-raise?

[Haplo]

Villain's vpip=50; af=1.98 in 163 hands.

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
8 players
Converter

Pre-flop: (8 players) Hero is MP2 with Q[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/heart.gif[/img]
UTG calls, 2 folds, Hero calls, CO folds, Button calls, SB calls, BB checks.

Flop: 5[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/diamond.gif[/img] ($2.5, 5 players)
SB checks, BB checks, UTG checks, <font color="#cc0000">Hero bets $1.6</font>, Button calls, SB folds, <font color="#cc0000">BB raises to $5</font>, UTG folds, Hero ????????

I'm putting the guy on a slowplayed two pair or a set (maybe, maybe AJ). Unfortunately there is someone behind me and I don't know what he has--hopefully not a flush draw.
So do you call? (or fold)