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
Macrophages are major source of? 
Select and explain. 
A. IL-1, B. IL-5, C. IL-7, D. IFN- y
A: IL-1
Answer: A: IL-1 
Explanation: IL-1 REF: Jawett's microbiology, 24th edition chapter 8 Immunology Table 8-3 See APPENDIX-19 for list of "CYTOKINES"