This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunity, Subject name: Pathology
[{'content': 'HLA complex in humans is located on? \nSelect and explain. \nA. Long arm of chromosome 6, B. Short arm of chromosome 6, C. Short arm of chromosome 8, D. Long arm of chromosome 8', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. b (Short arm of chromosome 6). (Ref Harrison's medicine 16th ed. 1930)MAJOR HISTOCOMPATIBILITY COMPLEX (MHC)# MHC is a gene cluster of various loci grouped together on a single locus.# The MHC of humans, or the HLA complex, is located on the short arm of chromosome 6 approximately 32 CM from the centromere.# The loci of the HLA complex may be divided into three classes: Class I, Class II, and Class III.# The products of Class I and Class II genes play an important role in the communication between cells. These MHC molecules are surface proteins which present antigenic peptides to T lymphocytes.", 'role': 'assistant'}]