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A variation on the Text question type is the Text List. This item provides the respondent with a list of answer options, and allows him/her to type 'free text' into a text field beside each option. This can for example be used to ask for comments on a number of related items.
The question details page for this item includes a number of fields and options. All the properties available for this question type are described in the Question Properties documentation (go to Accessing Question Properties for more information).
Figure 1 - The Text List item’s question details page
A Text List question requires an answer list (go to Answers, Prompts and Scales for more information).
Don't Know and Prefer Not to Answer Choices
When designing this question, you can choose to add "Don't know" and "Prefer not to answer" options.
These options will appear beneath the question when users take the survey; selecting either option allows the user to continue without entering an answer in the field.
Learn more here: Don't Know and Prefer Not to Answer Choices.