def get_challenge_record(self, challenge_record_type):
return<EOL>
Gets the challenge record corresponding to the given challenge record ``Type``.

        This method is used to retrieve an object implementing the
        requested record. The ``challenge_record_type`` may be the
        ``Type`` returned in ``get_record_types()`` or any of its
        parents in a ``Type`` hierarchy where
        ``has_record_type(challenge_record_type)`` is ``true`` .

        :param challenge_record_type: the type of challenge record to retrieve
        :type challenge_record_type: ``osid.type.Type``
        :return: the challenge record
        :rtype: ``osid.authentication.process.records.ChallengeRecord``
        :raise: ``NullArgument`` -- ``challenge_record_type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure occurred
        :raise: ``Unsupported`` -- ``has_record_type(challenge_record_type)`` is ``false``

        *compliance: mandatory -- This method must be implemented.*