This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'True about MHC \nSelect and explain. \nA. Transplantation reaction, B. Autoimmune disease, C. Immunosuppression, D. Involved in T cell function', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref Harrison 16/e p1930; Robbins 7/e p204_ 205 Also involved in autoimmune disease, involved T cell function MHC class II molecules are a class of major histocompatibility complex (MHC) molecules normally found only on professional antigen-presenting cells such as dendritic cells, mononuclear phagocytes, some endothelial cells, thymic epithelial cells, and B cells. Thesecells are impoant in initiating immune responses.', 'role': 'assistant'}]