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 all following except - \nSelect and explain. \nA. The pressure of forbidden clones, B. Expression of cryptic antigens, C. Negative selection of T-cells in the thymus, D. Inappropriate expression of the MHC proteins', 'role': 'user'}, {'content': "Answer: C \nExplanation: Altered T or B cell function also contribute to autoimmunity. Enhanced helper T cell and decreased suppressor T cell functions have been suggested as cause of immunity. - defect in the tymus, in stem cell development and macrophage function have also been postulated as causes. Reference: Anathanarayan & paniker's 9th edition, pg no: 179 <\\p>", 'role': 'assistant'}]