In such cases, it would be far simpler to use a single dropdown with Yes/No, etc. answers, so that only one choice is possible.
Creating mutually-exclusive checkboxes requires programming. If you really want to go down that path see, for example:
https://www.msofficeforums.com/word-...tml#post107008
https://www.msofficeforums.com/word-...html#post33489