How do you add options slowly to a dropdown menu?

how do you add options to the dropdown menu as the game progresses. like

if(this.gamObject.tag == "Fattyblob"){

Call Addtoindex();

}
void Addtoindex(){
add new object int option and sprite and text to dropdown menu


}

It can be done like so

public Dropdown dropDown;

if(this.gamObject.tag == "Fattyblob")
{
    Addtoindex();
}

void Addtoindex()
{
    if (dropDown != null)
    {
        dropDown.options.Add(new Dropdown.OptionData("New Option" + dropDown.options.Count));
    }
}