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': 'Interleukin 2 is produced by \nSelect and explain. \nA. T helper cells 2, B. Natural killer cells, C. T helper cells 1, D. Basophils', 'role': 'user'}, {'content': 'Answer: C \nExplanation: A) T helper -1 (TH1) secretes → IL-2 and interferon - γ\nB) T helper - 2 (TH2) secretes → IL-4, IL-5, IL-6, IL-13', 'role': 'assistant'}]