¹[54. Determination of question of disablement.--Any question--
         (a) whether the relevant accident has resulted in permanent disablement; or
         (b) whether the extent of loss of earning capacity can be assessed provisionally or finally; or
         (c) whether the assessment of the proportion of the loss of earning capacity is provisional or final; or
         (d) in the case of provisional assessment, as to the period for which such assessment shall hold good,
shall be determined by a medical board constituted in accordance with the provisions of the regulations and any such question shall hereafter be referred to as the "disablement question".]