"a X" helps exclude certain candidates

[KonradHoeffner]

For example, if the answer candidates are "enterprise system" and "model" then the user knows "model" is the correct answer because it would be "an enterprise system", not "a enterprise system".

Solution ideas:

1. always replace "an X" with "a X"
2. always replace "a X" with "an X"
3. always replace "an X" and "a X" with "X"

I prefer option 3.

[KonradHoeffner]

Could be done either in the question generation step or as an additional postprocessing in the Quiz application itself.
However the question generation is where this transformation happens right now so it should probably be included there.