This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'The professional antigen presenting cells are \nSelect and explain. \nA. Endothelial cells, B. Dendritic cells, C. T cells, D. B cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Professional APC Express MHC class II molecules Dendritic cells Immature dendritic cells (Langerhans cells) Macrophages B cells Non - professional APC Do not express MHC class II molecules Stimulated by cytokines like IFN Fibroblasts Thymic epithelial cells Thyroid epithelial cells Glial cells Pancreatic beta cells Endothelial cells', 'role': 'assistant'}]