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 is the most potent stimulator of naive cell? \nSelect and explain. \nA. Mature dendritic cell, B. Follicular dendritic cell, C. Macrophages, D. B cell', 'role': 'user'}, {'content': 'Answer: A \nExplanation: . Mature dendritic cell', 'role': 'assistant'}]