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 - 2, C. IL - 3, D. IL - 4
A: IL - 1
Answer: A: IL - 1 
Explanation: Macrophages are major source of IL - 1, IL - 8, IL - 12.