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: Microbiology
Which of the following features is not shared between `T cells' and B cells' - 
Select and explain. 
A. Positive Selection During Development, B. Class I MHC Expression, C. Antigen Specific Receptors, D. All of the above
A: Positive Selection During Development
Answer: A: Positive Selection During Development 
Explanation: None