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 folloss mg features is not shared between `T cells' and 'II 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: Ans. a. Positive selection during development