you wake up in a rooom

the room has 2 doors leading out, one leads to certain death, the other to certain freedom..

There are 2 men standing in the middle of the room.
One man ALWAYS tells the truth
The other ALWAYS lies.

you are only allowed to ask 1 question. directed at 1 of the men.

what question do you ask, to find out which door to go through?
(note: you want certain freedom)