Uncheck Dropdown Item at Runtime in Unity

This seems trivial but I’m having difficulty.

A user selects an item in a dropdown and this creates a little checkmark next to the item.

I want to deselect it in my code and remove that checkmark.

Any ideas?

Dropdown.value

Other Versions

public int value;
Description
The index of the currently selected option. 0 is the first option, 1 is the second, and so on.