Cumbrian Masons | Cumberland and Westmorland Puzzles page

WHICH DOOR IS IT?

The Wardens of a Lodge get bored one Lodge Meeting and decide to test the Logical thinking of visiting Brethren.

They tell the Visiting Brethren that they have a choice of two doors to enter; one leads to the Lodge Room and the other is the toilet.

The Wardens give each Visiting Brother a card with the following:
In front of each door stands a Warden who knows which door is the Lodge Room and which door is the toilet, but one of the Wardens will always tell a lie and the other one will always tell the truth. To go through the correct door, you are allowed to ask one Warden only one question that can be answered "yes" or "no", but unfortunately, you do not know which Warden is the liar. You will be banished to the Temple of Logical Illiteracy (and the toilet!) if you fail in your quest.

What question do the Visiting Brethren ask to enter the Lodge Room?