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
IL-1 and TNF - α during inflammation are secreted by 
Select and explain. 
A. Plasma cells, B. Activated macrophages, C. Lymphocytes, D. Platelet
B: Activated macrophages
Answer: B: Activated macrophages 
Explanation: None