<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A group of scientists is studying the mechanism by which the human papillomavirus HPV vaccine confers immunity. They observe that during the inoculation of test subjects, mammals with certain viral proteins result in the organisms antigen-presenting cells APCs absorbing the antigen and presenting it on major histocompatibility complex MHC class 1 molecules. Which of the following is the correct term for the process that the scientists are observing in this inoculation?? A: Endogenous antigen presentation, B: Cross-presentation, C: Priming of CD4 T cells, D: Adhesion, E: Ubiquitination,  <response>: This is a question about the process by which antigens from viruses are presented to the immune system. The key details in the question stem are:- Scientists are studying how the HPV vaccine works- They observe APCs taking up viral proteins and presenting them on MHC class 1 molecules- They want to know the name of this processThe answer choices give different names for processes related to antigen presentation. Based on the details in the question stem, the process being described is cross-presentation. This is when APCs take up exogenous antigens like viral proteins and present them on MHC class 1 to CD8 T cells. The other answer choices describe different processes not relevant to the details in the question stem.B: Cross-presentation 