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
[{'content': 'The role played by MHC proteins is to - \nSelect and explain. \nA. Transduce the signal to T cells following antigen recognition, B. Mediate immunoglobulin class - switching, C. Present antigens for recognition by T cell antigen receptors, D. Enhance the secretion of cytokines', 'role': 'user'}, {'content': 'Answer: C \nExplanation: . Present antigens for recognition by T cell antigen receptors', 'role': 'assistant'}]