<prompt> Acute cellular rejection following solid organ transplantation occurs:Within minutes to hours of transplantationWithin 48 hours of transplantationBetween 5 to 30 days of transplantationBeyond 30 days after transplantation  <response>: Ans. c Between 5 to 30 days of transplantationRef: Bailey 26th edition, Pages 1408-1412 Hyperacute - minutes to hours Acute Cellular rejection: Most common in 5-30 days first 6 months Chronic rejection after 6 months Most common cause of graft failure 