code: def get_choice_selected_value(self):
          
          if 'choiceInfo' not in self.dto[self.name]:
              raise GPException('not a choice parameter')
          choice_info_dto = self.dto[self.name]['choiceInfo']
          if 'selectedValue' in choice_info_dto:
              return self.dto[self.name]['choiceInfo']['selectedValue']
          else:
              return None
docs: Returns the default selection from a choice menu
          Throws an error if this is not a choice parameter.