This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'MHCll positive cells are. Except \nSelect and explain. \nA. B cells, B. T cells, C. Macrophage, D. Platelet', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref Robbins 7/e p203; 9/e p194 Ananthanaraya 7/e p130 T cells platelet and RBC MHC class II molecules are a class of major histocompatibility complex (MHC) molecules normally found only on professional antigen-presenting cells such as dendritic cells, mononuclear phagocytes, some endothelial cells, thymic epithelial cells, and B cells. Thesecells are impoant in initiating immune responses.', 'role': 'assistant'}]