<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def sponsor_or_site(self, value):
 """Set Originator with validation of input"""

        if value not in Comment.VALID_SPONSOR_OR_SITE_RESPONSES:
            raise AttributeError("%s sponsor_or_site value of %s is not valid" % (self.__class__.__name__,
                                                                                  value))
        self._sponsor_or_site = value