This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Pathology
[{'content': 'IL-2 activates Th 1 /CD 4 through \nSelect and explain. \nA. NK cells, B. Th cells, C. T memory cells, D. All the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) All the above', 'role': 'assistant'}]