Assume the guard A is by door A and guard is by door B. Let the prisoner go to guard A and ask him the question. One of the typical question is: "If I ask guard B what door is door B, the answer from guard B will be life door or death door?"
If the answer is life door (door B), he can walk in the door A safely. If the answer is death door(door B), he can choose the door B and walk in.
This is because the question goes through 2 levels of questions from 2 people. The overall answers will be always a lie because there is always one lying and the other telling the truth. He can always choose the other door to the answer.
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