If we want the respondent to have the possibility to enter their own answer when choosing the Other option, we must add an answer with the content Other in the question editor, and then check the Custom answer option next to it. Thanks to this, after selecting this answer, the respondent will see an additional text field where they will be able to enter their suggestion. This answer will be saved along with the other results and will be visible in the report.

You can also check the option that entering an answer will be mandatory.