This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
The hypersensitivity reaction involved in the hyper acute rejection of renal transplant is 
Select and explain. 
A. Type I, B. Type II, C. Type III, D. Type IV
C: Type III
Answer: C: Type III 
Explanation: Ans. is 'c' i.e., Type III Pre-existing antibody against donor graft antigens can cause hyperacute graft rejection. . This form of rejection occurs within minutes or hours after transplantation "The graft becomes engorged and purple coloured . These early lesions point to an antigen-antibody reaction at the level of vascular endothelium. The antigen-antibody reaction produces an Ahus-type (type-III) immune complex injury in the vessels of the transplant."