code: def report_question(self, concern, pub_name, ext_name, question_id):
          
          route_values = {}
          if pub_name is not None:
              route_values['pubName'] = self._serialize.url('pub_name', pub_name, 'str')
          if ext_name is not None:
              route_values['extName'] = self._serialize.url('ext_name', ext_name, 'str')
          if question_id is not None:
              route_values['questionId'] = self._serialize.url('question_id', question_id, 'long')
          content = self._serialize.body(concern, 'Concern')
          response = self._send(http_method='POST',
                                location_id='784910cd-254a-494d-898b-0728549b2f10',
                                version='5.1-preview.1',
                                route_values=route_values,
                                content=content)
          return self._deserialize('Concern', response)
docs: ReportQuestion.
          [Preview API] Flags a concern with an existing question for an extension.
          :param :class:`<Concern> <azure.devops.v5_1.gallery.models.Concern>` concern: User reported concern with a question for the extension.
          :param str pub_name: Name of the publisher who published the extension.
          :param str ext_name: Name of the extension.
          :param long question_id: Identifier of the question to be updated for the extension.
          :rtype: :class:`<Concern> <azure.devops.v5_1.gallery.models.Concern>`