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': 'The HLA class3 region genes are impoant element in \nSelect and explain. \nA. Translate rejection phenomenon, B. Governing susceptibility to autoimmune disease, C. Immune surveillance, D. Antigen presentation and elimination', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref Robbins 9/e p215 Anantha Narayana 6/e p108 Class III molecules include several secreted proteins with immune functions: components of the complement system (such as C2, C4, and B factor), cytokines (such as TNF-a, LTA, and LTB), and heat shock proteins.', 'role': 'assistant'}]