You stand in front of two doors that can speak and answer a question. The first door leads to the city of truth, while the other door leads to the city lying. You do not know which door leads to any city. You can only ask one question to determine the destination of any door. The door that leads to the liar city always lies, while the door that leads to the city of truth always tells the truth. You have to go to the city of truth. What question will you ask to determine which door leads to the City of Truth?