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': 'Most potent stimulator of NaiveT-cells - \nSelect and explain. \nA. Mature dentritic cells, B. Follicular dentritic cells, C. Macrophages, D. B-cell', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Question repeated', 'role': 'assistant'}]