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': 'IL-I is produced by \nSelect and explain. \nA. Macrophage, B. Helper T lymphocytes, C. B cells, D. Cytotoxic T-cells', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) Macrophage Ref. Ananthanarayan 8/e, p 148, 9/e, p 154; Robbin's 7/e, p 82 Already explained in answer no. 5", 'role': 'assistant'}]