The catalog item itself contains a list collector that points to the question_choice table. I also use a reference qualifier to fetch in the dropdown menu only values I want.

But I am not sure how to proceed with the flow. How to retrieve the values that were submitted by the user, compare them against specific values (I need to see if user selects ANY of specific options, let s say I have a list "x", "y" and "z" and if one of the values selected by users is at least one of these there is a task created for a specific assignment group).

Do you need more info?