code: def _choices(self):
          
          # Generate key/value strings
          pairs = []
          for key, value in self.choices.items():
              pairs.append(str(value) + "=" + str(key))
  
          # Assemble into overall string and escape
          return GPTaskSpec.manifest_escape(";".join(pairs))
docs: Generate a string of choices as key/value pairs
          :return: string