Hi everyone.
Please help me with the situation.
So I have a mandatory question -multiple choice or single choice with the "other" option enabled
I want the other option (text input) to be non mandatory so they can specify it ot not.
I can see question validation equation to have a potential but not sure what the formula is.

Thank you so much for the help.

With multiple choice : you can not easily

With single choice : manual.limesurvey.org/Question_type_-_Li...comment_mandatory.29

With multiple-choice...

1) Disable built-in, "Other".

2) Add your own "Other" option.

3) Add a following non-mandatory short-text question, shown when "Other" checked.