Path to freedom

Suppose that you are a prisoner who is suddenly granted the right to go free, but only if you cope with this task: you have two doors, one of them leads to the will, the other is the road to death.



Two guards are sitting, one of them being a liar, and the other is always telling the truth; you do not know which one is who. You must, by asking just one question to one of the guards, determine the path to freedom.



What question will you ask?