<prompt> Acute cellular rejection following solid organ transplantation occurs-Within minutes to hours of transplantationWithin 48 hours of transplantationBetween 5 and 30 days of transplantationBeyound 30 days after transplantation  <response>: acute graft versus host disease occurs within days to weeks after allogenic bone marrow transplantation.Reference;Robbins and Cotran pathologic basis of disease South Asia edition. 