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: Medicine
[{'content': 'The most potent stimulator of native T-cell is: \nSelect and explain. \nA. Follicular dendrite cells, B. Mature dendrite cells, C. Epithelial cells, D. Macrophage', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]