This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'Autoimmunity can be caused due to all of the following except: \nSelect and explain. \nA. Forbidden clones, B. Expression of cryptic antigens, C. Negative selection of T cells in thymus, D. Inappropriate expression of MHC proteins', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' Negative selection of T cell in thymusNegative selection is needed to prevent autoreactive T cells to come into circulation and cause autoimmunity, cryptic antigens are antigenic epitopes which are normally hidden and their exposure leads to development of immune response and in appropriate expression of MHC proteins also leads to development of self-destructive immune system.", 'role': 'assistant'}]