<prompt> Chronic graft rejection occurs due to what type of hypersensitivity reactionType IVType IIIType IIType I  <response>: Graft rejection is an immunologic destruction of transplanted tissues or organs between two members or strains of a species differing at the major histocompatibility complex for that species i.e., HLA in man and H-2 in the mouse. Ref microbiology textbook 8e ananthnarayana 