reasonable medical examination or treatment as the Commissioner considers necessary or desirable in the circumstances. (2) If a disabled person fails or refuses to undergo any medical examination or treatment required in terms of subsection (1) and does not, within a period of six weeks from the date upon which he was required to undergo that examination or treatment, furnish to the Commissioner a satisfactory explanation for his failure or refusal to do so, his right to his disablement pension shall be suspended with effect from the expiration of such period or such later date as the Commissioner may determine. (3) If a disabled person whose disablement pension is suspended in terms of subsection (2) subsequently undergoes the medical examination or treatment, as the case may be— (a) within a period of six months from the date on which his disablement pension was suspended, and the medical examination reveals or the treatment produces, as the case may be— (i) no change in the degree of disablement, his disablement pension shall be restored with effect from the date on which it was suspended; (ii) a reduction in the degree of disablement, his disablement pension shall be restored with effect from the date upon which it was suspended at the rate appropriate to such reduced degree of disablement; (iii) an increase in the degree of disablement, his disablement pension shall be restored with effect from the date upon which it was suspended at the rate at which it was payable immediately before it was so suspended and shall be adjusted with effect from the first day of the month following that in which the disabled person undergoes the medical examination or treatment to the rate appropriate to the degree of disablement as so increased; (b) after a period of six months from the date upon which the disablement pension was suspended, the disablement pension shall be restored with effect from the first day of the month following that in which the disabled person undergoes the medical examination or treatment at the rate appropriate to the degree of disablement determined as a result of such medical examination or treatment. (4) If a disabled person is aggrieved at being required by the Commissioner to undergo a medical examination or treatment in terms of subsection (1), he may apply to the Commissioner in writing to refer to a medical board the question of whether or not the medical examination or treatment he is required to undergo is reasonable in the circumstances, and the Commissioner shall refer the matter to a medical board. (5) The opinion of a medical board as to whether or not any medical examination or treatment which a disabled person is required to undergo in terms of subsection (1) is reasonable shall be final, and if such board is of the opinion that— (a) the examination or treatment is not reasonable; or (b) the treatment will not have the effect of reducing the degree of disablement of the disabled person; the disablement pension of the disabled person shall not be suspended by virtue of his refusal to undergo the medical examination or treatment and, if it has already been suspended, it shall be restored with effect from the date on which it was suspended. 12 Refund of medical expenses (1) Subject to this section, a disabled person shall be entitled to be paid a refund of any expenses reasonably and necessarily incurred by him as a result of his injury in respect of— (a) dental, medical, surgical or hospital treatment; or (b) skilled nursing services; or (c) the supply of medicines or surgical dressings; or (d) the supply, maintenance, repair or renewal of artificial limbs or apparatus. (2) The question whether or not any expenses referred to in subsection (1) have been