This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Pathology
[{'content': 'Memory T cells can be identified by using the following marker: \nSelect and explain. \nA. CD45RA, B. CD45RB, C. CD45RC, D. CD45RO', 'role': 'user'}, {'content': "Answer: D \nExplanation: CD 45 is called as Leukocyte common antigen (LCA) Location of cell Molecular marker All leucocytes CD45 and CD45RB Medullary thymocytes ('Naive' T- cells) CD45 RA and CD45RC Coical thymocytes (Memory T-cells) CD45RO", 'role': 'assistant'}]