You find yourself in a room with two doors. One door leads to freedom, and the other door leads to a room full of deadly traps. There are two guards, one in front of each door. You know that one guard always tells the truth, and the other guard always lies. You don't know which guard is which, nor do you know which door leads to freedom. You can ask only one question to either guard to determine the door that leads to freedom. What question do you ask?