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': 'Which of the following does not present antigens: \nSelect and explain. \nA. NK cells, B. Dendritic cells, C. Langerhans cells, D. Macrophages', 'role': 'user'}, {'content': 'Answer: A \nExplanation: APC (Antigen-presenting cell):\xa0\n\nMost common APC → Immature dendritic cell.\nThe most potent stimulator of native T cell → Mature dendritic cell.\nAPCs are – Dendritic cells, Langerhan’s cells, B-cell.', 'role': 'assistant'}]