promptOption()
Displays a list of options and prompts the user to select one.
For the list, the function takes an ordered set with a comma-separated list of options.
When you set true, the options are listed in a drop-down menu. Setting
false results in a list of radio buttons.
Example 17.8: Example
{ m:'Select a color from the list:'.promptOption(OrderedSet{'red', 'green',
'blue'}, true) }