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: Pathology
[{'content': 'Cell type that lacks HLA antigen is: \nSelect and explain. \nA. Monocyte, B. Thrombocyte, C. Neutrophil, D. Red blood cell', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Class I MHC is expressed on all nucleated cells and platelets Class II MHC is expressed on APCs (macrophages, monocytes and dendritic cells), B- cells, Endothelial cells, and fibroblasts.', 'role': 'assistant'}]