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': 'The cells responsible for long lasting immune protection to a paicular pathogen are called \nSelect and explain. \nA. T helper cells, B. B helper cells, C. T memory cells, D. B memory cells', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Memory B cells are more long-lasting and specific than memory T cells because memory B cells have more robust DNA repair mechanism (which provide ability to maintain somatic hypermutations)', 'role': 'assistant'}]