This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Memory T cells can be identified by using the following \nSelect and explain. \nA. CD 45RA, B. CD45RB, C. CD45RC, D. CD45RO', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref Harrison 17/e p2021 CD45 (lymphocyte common antigen) is a receptor-linked protein tyrosine phosphatase that is expressed on all leucocytes, and which plays a crucial role in the function of these cells. ... These CD45-associated molecules may play an impoant role in regulatingCD45 tyrosine phosphatase activity and function. Present on memory T cells', 'role': 'assistant'}]