You Stand In Front Of Two Doors

You stand in front of two doors. A guard stands next to each

door. You know the following things: one path leads to

paradise, the other leads to death. You cannot distinguish

between the two doors. You also know that one of the two

guards always tells the truth and the other always lies. You

have permission to ask one guard one question to discover

which door leads to paradise. What one question would you

ask to guarantee you enter the door to paradise?