code: def prompt_for_bilateral_choice(self, prompt, option1, option2):
          
          if prompt is None:
              prompt = ''
          prompt = prompt.rstrip() + ' (' + option1 + '/' + option2 + ')'
          while True:
              user_input = self.__screen.input(prompt)
              if str(user_input).lower() == option1.lower():
                  return option1
              elif str(user_input).lower() == option2.lower():
                  return option2
docs: Prompt the user for a response that must be one of the two supplied choices.
          NOTE: The user input verification is case-insensitive, but will return the original case provided
          by the given options.