Dropdown / Select input - clear other values

[pksorensen]

When having a option list, where min/max items allow multiple choices, it would be good if its possible to specify a option to clear other options.

Example here is the user picking between 1 or multiple options, but one option is that he is not interested and therefore if any other values have been selected these should be cleared.

If then picking another option again, that one should be cleared again.