You approach two talking doors. One door leads to the City of Truth, while the other door leads to the City of Liars. You do not know which door is which. You are able to ask only one question to determine which door is which. The door that leads to the City of Liars always speaks lies, while the door that leads to the City of Truth always speaks the truth. You want to go to the City of Truth. What question do you ask to determine which door leads to the City of Truth?

You ask either door - "If I were to ask the other door which door leads to the City of Truth, what would he say?" Regardless of the answer, you pick the opposite door and you're in the City of Truth.

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