How do I create this? If the user selects Other, I want another form field to show.

Well, put that other with display none and create some css
.other_class {
display:none;
}
select[data-chosen=‘Other’] .other_class {
display:block;
}
How do I create this? If the user selects Other, I want another form field to show.

Well, put that other with display none and create some css
.other_class {
display:none;
}
select[data-chosen=‘Other’] .other_class {
display:block;
}