The other method which I can think of is to cut Aluminium foil in strips and stick it on card paper just like PCB tracks. Connect only the strip with correct answer to the bulb. In order to make foil track invisible, cover the base card with picture or question and its option numbers.
See sample schematic below. A B C & D are option points which are only visible through hole in the upper picture layer and can come in electrical contact with the foil track.
In this way you can create as many cards as you want.
I hope I am making myself clear.