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: Pathology
[{'content': 'MHC class III genes encode: \nSelect and explain. \nA. Complement component C3, B. Tumor necrosis factor, C. Interleukin 2, D. Beta 2 microglobulin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: HLA class III contains genes for Complement components C2 and C4Q of classical pathway (Not C3Q) Properdin factor BQ of alternate pathway Tumor necrosis factorQ: Alpha and Beta Heat shock protein 70 Q Enzyme tyrosine hydroxylase Genes for MHC (also known as HLA) are located on sho arm of chromosome 6.', 'role': 'assistant'}]