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
The type of immunological reaction seen in endothelial corneal graft rejection is - 
Select and explain. 
A. Type II, B. Type IV, C. Type III, D. Type I
B: Type IV
Answer: B: Type IV 
Explanation: Harshmohan textbook of pathology 7th edition. Type 4 or delayed hypersensitivity is T cell mediated reaction. Egs are: reaction against mycobacterial infection, reaction against virally infected cells, reaction against malignant cells and reaction against organ transplantation. .