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: Pathology
[{'content': 'Which of the following is a T-cell marker? \nSelect and explain. \nA. CD45, B. CD8, C. IL3, D. CD19', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Important cells with their CD marker are:-', 'role': 'assistant'}]