riddle of the twins

You come across a pair of twins at a fork in the road
down one road lies your goal
down the other certain death
the twins will tell you which road to take
however one twin only tells the truth
the other one only tells lies
you are allowed only one question.
What do you ask to get the correct answer?



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Answer: If I were to ask the other twin which road is the correct one, what would he say. You will recieve the lie from both twins, and therefore the other path is the correct one.