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: Microbiology
[{'content': 'HLA -A, B, C belongs to which class of HLA Complex of genes located on 6th chromosome \nSelect and explain. \nA. Class I, B. Class II, C. Class III, D. Class IV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HLA-A, HLA B HLC -Class I HLA DR DQ DP -Class II HLA BF C2 TNF etc. -Class III There is no class IV Ref: Textbook of Microbiology Baveja 5th ed Pg 133', 'role': 'assistant'}]