def callback_ResetDropdown(window):
    """
    Updates the dropdown after newVal is selected and applied

    Parameters
    -------------
    window = GUI object

    Returns None
    -------------
    """
    # set values and value to empty to get rid of previously specified answers
    window['changeMod'].update('Change ___:')
    window['changeOptions'].update(values=[''])
    window['changeOptions'].update(value='')

    return None