<prompt> Method of prevention of GVHD in bone marrow transplantation is?T-cell removalPrior immune suppressionPost procedure immune suppressionAll of the above  <response>: Treatments used to prevent GVHD include1 Prior immunosuppressionCiclosporin is used most commonly. This drug works by reducing the number of T cells in donated marrow or stem cells. Started a couple of days before transplant and continued for about 6 months after the transplant.Other drugs used are- MMF, tacrolimus, sirolimus2 T cell depletion from the marrow or stem cellsRemoval of T cells from donors bone marrow after it has been donated, or during the donation of stem cells. This method is not commonly used.3 Treatment after transplantLow doses of the chemotherapy drug methotrexate to suppress your immune system. This helps to keep the t cells down and so stops them attacking body cells. Cyclophosphamide is also used. 