<prompt> No prior immune suppression is helpful in which type of graft rejection?AcuterejectionHyperacute rejectionChronic rejectionNone of the above  <response>: Ans is b i.e. Hyperacute rejectiono Hyperacute rejection is caused by ABO incompatibility and preformed cytotoxic antibodies against donor HLA antigens. Therefore immunosuppressant is not helpful. 