Stuck in Prison

You are in prison.
You are put in a room.
There are two doors
And two twins guarding the doors.
You know that one door leads to certain death, and one leads to freedom, but you don't know which door is which; however, the twins do know.
You also know that one of the twins is a compulsive lier, and the other only ever tells the truth. The twins are aware of their differences (but they don't seem to let that get between them, now do they?)
You are allowed one question to assertain which door to go through - What is your question?

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