This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'HLA is present on- \nSelect and explain. \nA. Sho term of chromosomes 3, B. Sho arm of chromosomes 6, C. Long arm of chromosomes 3, D. Chromosome 15', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Reference :Robbins basic pathology 9th edition pg no 102 :loci named HLA A,HLA B and HLA C.Each of these molecules it&;s a hetero dimer consisting of polymorphic 44kDa alpha chain noncovalently associated with an invariant 12 kDa beta2 microglobulin polypeptide (encoded by a separate gene on chromosome 15)', 'role': 'assistant'}]