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
[{'content': 'HLA is present on – \nSelect and explain. \nA. Short arm of chromosomes 6, B. Short term of chromosomes 3, C. Long arm of chromosomes 3, D. Long arm of chromosomes 6', 'role': 'user'}, {'content': 'Answer: A \nExplanation: o HLA complex (MHC) gene is located on the short arm of chromosome 6.\no The histocompatibility antigens (human leukocyte antigens - HLA) are cell surface antigens that induce\nan immune response leading to the rejection of allografts.\no The principal physiologic function of the cell surface histocompatibility molecules is to bind peptide\nfragments of foreign proteins for presentation to antigen-specific T cells.\no The histocompa', 'role': 'assistant'}]