Vocabulary test auto proof should run without words in brackets

Hi,
not sure if I post this in the right section. If necessary please move.

I’m rather often getting confused with the solution when the word is not automatically accepted as right, when there are more words (using other grammar forms in brackets)
Of course it will help to know the other forms of the word, but also confuse people while studying. Entering each and everything would end up in much work to remember brackets and colons as well
For example in course Russian course 6 level 6 following vocabularies have the issue (there are more for sure also in other courses).
Vocabulary example:
тот (та; то)
этот (эта; это)

Thank you