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
[{'content': "Which of the folloss mg features is not shared between `T cells' and 'II cells' \nSelect and explain. \nA. Positive selection during development, B. Class I MHC Expression, C. Antigen Specific Receptors, D. All of the above", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Positive selection during development', 'role': 'assistant'}]