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': 'Most Potent Stimulator of Naive T-cell is: \nSelect and explain. \nA. Mature dendritic cells, B. Follicular dendritic cells, C. Macrophages, D. B-cell', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mature dendritic cells', 'role': 'assistant'}]