correct answer shows as wrong

If I understand the above comment correctly, I have the same problem:

that is:
multiple choice:

I give 2 possible correct answers when creating a question:
Say, correct articles for “in … Zimmer”: both “das” and “die” are correct
AND
I would expect only one answer be marked…

yet when student puts a check to (say) “das”, program says it is incorrect, as not both “das” and “die” were marked.
But I did not want both marked! – one of the two possible right answers should be accepted as “correct”!

Is it possible with setting the quiz question?

Use single choice, use different points for each answer, give 10 point to correct answers, and give 0 point to wrong answer.