Every claimant for and every beneficiary in receipt of disablement benefit shall comply with every direction given to him by the appropriate Regional Office which requires him either —
(i) to submit himself to a medical examination by such medical authority as may be appointed by that office for the purpose of determining the effect of the relevant employment injury or the treatment appropriate to the relevant injury or loss of faculty, or
(ii) to attend any vocational training courses or industrial rehabilitation courses provided by any institution maintained by any Government, local authority or any public or private body recognised for the purpose by the Corporation and considered appropriate by it in his case.