Welcome to the forum @Ferdinand and thanks for adding your profile picture. It helps build community! When you get a chance, please introduce yourself on this forum thread.
If the first question is a select_one then you can use a choice filter on the second question.
You could also create a question for each set of sub answers and then use the relevant
to show or hide as needed. You can see examples of both in filter_options.xlsx (10.2 KB) and you can use https://getodk.org/xlsform/ to test it. There's more information about XLSForm at https://xlsform.org/en/ and https://docs.getodk.org/xlsform/.