code: def get(self, sid):
          
          return ChallengeContext(
              self._version,
              service_sid=self._solution['service_sid'],
              identity=self._solution['identity'],
              factor_sid=self._solution['factor_sid'],
              sid=sid,
          )
docs: Constructs a ChallengeContext
  
          :param sid: A string that uniquely identifies this Challenge, or `latest`.
  
          :returns: twilio.rest.authy.v1.service.entity.factor.challenge.ChallengeContext
          :rtype: twilio.rest.authy.v1.service.entity.factor.challenge.ChallengeContext