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': 'Cell type which lacks HLA antigen is - \nSelect and explain. \nA. Monocyte, B. Thrombocytes, C. Neutrophil, D. Red blood cell', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Class I products of the genes of the major histocompatibility complex (MHC), HLA-A, -B, and -C, are present on viually all nucleated cells. Mature human red blood cells are not nucleated and do not generally have easily detectable HLA antigens, Reff: www.mayoclinin.com', 'role': 'assistant'}]