NL25 rush straight on the board

[babyonboard]

$0.10/$0.25 No Limit Holdem
FullTiltPoker
6 Players
Hand Conversion Powered by weaktight.com

Stacks:
UTG Mishaal ($27.41)
UTG+1 Hero ($25)
CO x-micro ($19.20)
BTN bazill8888888 ($19.75)
SB miees ($9.96)
BB okutonoken ($22.14)

Pre-Flop: ($0.35, 6 players) Hero is UTG+1
1 fold, Hero raises to $0.75, 3 folds, okutonoken calls $0.50

Flop: ($1.60, 2 players)
okutonoken checks, Hero bets $1, okutonoken raises to $2, Hero calls $1

Turn: ($5.60, 2 players)
okutonoken checks, Hero checks

River: ($5.60, 2 players)
okutonoken bets $5.80, Hero ???

to call or not to call? villain: 29/18 (53 h) no history at all.

[castor11]

I would fold on the river.