<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 67-year-old man comes to the physician because of a 3-day history of fever, chills, headache, and fatigue. He appears ill. His temperature is 39C 102.2F. Analysis of nasal secretions shows infection with an enveloped, single-stranded segmented RNA virus. In response to infection with this pathogen, certain cells present antigens from the pathogen to CD8 T-lymphocytes. Which of the following statements about the molecules used for the presentation of these antigens is most accurate?? A: The antigens are loaded onto the molecule within lysosomes, B: The molecule consists of a heavy chain associated with β2 microglobulin, C: The molecule is made up of 2 chains of equal length, D: The molecule is selectively expressed by antigen-presenting cells, E: The molecule is a product of the HLA-DP, HLA-DQ, and -DR genes,  <response>: This is a question about antigen presentation to CD8 T cells. Based on the description, the patient likely has influenza, which is an enveloped, single-stranded RNA virus. CD8 T cells recognize antigens presented on MHC class I molecules. The key points about MHC class I molecules are:- They are expressed on all nucleated cells, not just antigen presenting cells. So D is incorrect.- They consist of a heavy chain and a light chain called β2 microglobulin. So B is correct. - The heavy chain is encoded by the HLA-A, HLA-B, and HLA-C genes, not the HLA-DP, DQ, and DR genes which encode MHC class II. So E is incorrect.- Antigens are loaded onto MHC class I molecules in the endoplasmic reticulum, not lysosomes. So A is incorrect. - The two chains are of unequal length, not equal length. So C is incorrect.In summary, the only statement that accurately describes MHC class I molecules is B.B: The molecule consists of a heavy chain associated with β2 microglobulin 