This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Rejection which may appear within minutes or hours of transplantation is 
Select and explain. 
A. Hyperacute Rejection, B. Acute cellular (T cell-mediated) rejection, C. Acute antibody-mediated rejection, D. Chronic Rejection
A: Hyperacute Rejection
Answer: A: Hyperacute Rejection 
Explanation: Hyperacute RejectionThis form of rejection occurs within minutes or hours after transplantation. It occurs when preformed anti-donor antibodies are present in the circulation of the recipient.Ref: Robbins and Cotran Pathologic Basis of Disease; 9th edition; Chapter 6; Diseases of the Immune System; Page no: 233