"None" option that unticks the other answers

Hi,
I am not sure if I understand your question correctly.
In case you are looking for this feature in multiple choice selection question, then add 'None' as one of the choice and click on the dropdown option next to the choice, you will see an option as 'Make Answer Exclusive'. This will ensure that all the other options selected automatically unticks when exclusive choice is selected.
In case this is for other question's answer options, you will need writing custom javascript/jquery to achieve this.
I hope this answers you question.
All the best with your project!