code: def _unwrap_response_single(cls, obj, wrapper=None):
          
  
          if wrapper is not None:
              return obj[cls._FIELD_RESPONSE][cls._INDEX_FIRST][wrapper]
  
          return obj[cls._FIELD_RESPONSE][cls._INDEX_FIRST]
docs: :type obj: dict
          :type wrapper: str|None
  
          :rtype: dict