<prompt> Cells responsible for GVHD is ?Immunocompetent T cell donorImmunocompetent T Cell recipientImmunocompetent B cell donorImmunocompetent B cell donor  <response>: Ans. is a i.e., Immunocompetent T-cell donor Graft- versus-host disease GVHD :? GVHD occurs when immunologically competent cells T cells or their precursors are transplanted into immunologically crippled recipients, and the transferred cells recognize alloantigens in the host and attack host tissues. Most commonly involved tissues in Graft versus host disease :- Liver Skin Gut 