Sometimes, the good old riddles are amazing tests of logic.
A girl is stuck in a labyrinth, and after many hours of wandering through it, comes upon two majestic doors, with large, round iron door-knockers with ancient symbols on them. A wooden sign placed in the middle of both of them, states thus:
Two doors stand before you,
One door must speak the truth,
One door only utters lies.
One of them leads to certain death,
The other, to sanctuary and beyond.
Knock on each door, and you may ask it a single question.
Listen well, lest it’s answer be your last.
How does the girl get out of the labyrinth?