This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
MHC class III genes encode 
Select and explain. 
A. Complement component C3, B. Interleukin 2, C. Tumor necrosis factor, D. Beta 2 microglobulin
C: Tumor necrosis factor
Answer: C: Tumor necrosis factor 
Explanation: *HLA class III contains genes for
• Complement components C2 and C4 of classical pathway (Not C3)
• Properdin factor B of alternate pathway
• Tumor necrosis factor: Alpha and Beta
• Heat shock protein 70 
• Enzyme tyrosine hydroxylase
• Genes for MHC (also known as HLA) are located on short arm of chromosome 6.