This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
Memory T cell can be identified using the following marker 
Select and explain. 
A. CD45RA, B. CD45RB, C. CD45RC, D. CD45RO
D: CD45RO
Answer: D: CD45RO 
Explanation: .