What question??Riddle?

Question

Hello, I have an incredibly hard puzzle to solve, here it is.

There is a prisoner, and in front of him there are two doors, one leads to freedom, the other to certain death, he doesn't know which one is which. There are two guards , guarding one door each, they know which door leads to death and freedom. One guard always lies, the other always tells the truth, the prisoner doesn't know which one lies and which one is truthful. To ensure he goes for the right door, which ONE question can he ask?
(The guards can only answer yes or no.)

Answer 1

a question with an obvious answer

Answer 2

Dealing with true and false? Is this what our life is being spend on? But sometimes we miss the gray area.

Anyway, asking the following question from either guard will point you to the same door:

Ask one of the guards, If I ask the other guard which door leads to haven, which door he will point to?

The truthful guard will point to the door to hell, because he knows that the liar guard would want to lie to the prisoner and point him the wrong door.

The liar guard would point to the door to hell, because he lies always and would lie about which door the truthful guard would point to.

If ask the Truth from the TrueGenerator commenting on the FalseGenerator then
answer = False;
If ask the Truth from the FalseGenerator then
answer = False;

Answer 3

He can go to any one guard and ask him, "Will the other guard say YES if I ask him, 'Is this the door leading to freedom?' ".
If the answer of that guard is YES, the prisoner should take the opposite door.

Answer 4

Ask one of the guards, "what the other one would say about is this door the door to freedom?" then do the opposite.

Answer 5

Ask either one if a certain door leads to freedom.

Answer 6

Cheap shot! You got this from the Labyrinth!