This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Cachectin is produced by - 
Select and explain. 
A. Neutrophils, B. Eosinophils, C. Macrophages, D. Basophils
C: Macrophages
Answer: C: Macrophages 
Explanation: a protein that is released by activated macrophages as an immune system defense and, when the defense is overwhelmed, is a cause of cachexia or toxic shock: in humans, identical with tumor necrosis factor. Reff: www.mayoclinic.com