This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Non professional antigen presenting cell is A/E – \nSelect and explain. \nA. Red blood cells, B. Endothelial cell, C. Epidermal cell, D. Fibroblasts', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Non-professional antigen presenting cell\no A non-professional APC does not constitutively express the Major Histocompatibility Complex class II\n(MHC class II) proteins required for interaction with naive T cells; these are expressed only upon\nStimulation of the non- professional APC by certain cytokines such as IFN-γ.\n\xa0All nucleated cells express the Major Histocompatibility Complex class I necessary to be considered a\nNon- professional APC.\n\xa0As erythrocytes do not have a nucleus, they are one of the few cells in the body that cannot display\nAntigens.', 'role': 'assistant'}]