The Two Guards

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don\’t know the identity of the two.You can ask only one question to go out from there. What should you ask?

Spoiler

If you ask the guard who always tells the truth, he would tell you the other guard would point you to the door of death.  If you ask the guard who always lies, he would tell you the opposite door of the truth-telling guard and point you to the door of death.  In either case, both guards will point to the door of death so you should choose the other one.

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