25PLO top set vs total uknown scary board

[paulw]

Villan has just sat down and is totally unknown, whats the standard line in this spot?

Full Tilt Poker - Pot Limit Omaha Cash Game - $0.10/$0.25 Blinds - 5 Players - (LegoPoker Hand History Converter)

SB: $26.35
BB: $17.65
UTG: $24.65
CO: $54.05
Hero (BTN): $26.80

Preflop: Hero is dealt 5[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/club.gif[/img] (5 Players)
<font color="red">UTG raises to $0.85</font>, CO folds, <font color="red">Hero raises to $2.90</font>, 2 folds, UTG calls $2.05

Flop: ($6.15) Q[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">UTG bets $6.15</font>, Hero?

Whats your play vs. a total unknown?
Cheers