The Polar / Boolean question type uses the Yes and No answer options.
How to configure a question using Polar / Boolean:
Go to Toolbox portlet on the left side of the screen in the survey builder.
Click on Polar / Boolean. The question type is populated on the section page.
Click on the question, Configuration portlet displays on the right.
Click on the Required check box if you want to make this question mandatory for the surveyee to complete.
Click Save when you are done with the configuration.