What was the answer to Labyrinth riddle question? best answer~?

Question

In the movie, Labyrinth (1986), starring Jennifer Connelly and David Bowie, what was the riddle the two doors (left and right, I think) asked Sarah, and what was the answer??

What door did she take?

and explain how she got it...

Answer 1

Riddle is:

One of us will tell you true,

One will always lie.

Just one question is your due,

And only one reply.

One right answer gets you through,

Which door will you try?

Answer is:

Sarah asks which door leads to the castle gate then she figures out the riddle and chooses a door

One Guard always lies, and one always tells the truth. This is absolute. So when Sarah asks Guard A to tell her what Guard B would say, she knows it will be a lie, no matter what. If Guard A were the liar, he would have to lie about what Guard B would have said. Since Guard B would have told the truth, Guard A would then have to tell the lie to Sarah. However, if Guard B were the liar, he would obviously have lied. However, Guard A would then have to answer the question truthfully which would be the lie from Guard B. Hence, no matter which guard is the liar and which guard is the truth-teller, the answer that Sarah gets would have one and exactly one lie in the answer. Knowing this, Sarah takes the other road.

Answer 2

Try the Movies forum, you may get a better response there.