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: Pathology
The role played by Major Histocompatibility Complex-1 and -2 is to 
Select and explain. 
A. Transduce the signal to T-cells following antigen recognition, B. Mediate immunogenic class switching, C. Present antigens for recognition by T-cell antigen receptors, D. Enhance the secretion of cytokines
C: Present antigens for recognition by T-cell antigen receptors
Answer: C: Present antigens for recognition by T-cell antigen receptors 
Explanation: The role played by Major Histocompatibility Complex-1 and -2 is to present antigens for recognition by T
cell antigen receptors.
‘Main function of MHC molecule is to bind peptide fragments of foreign protein for presentation to appropriate antigen-specific T cells.’