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: Pathology
Which of these is false regarding cytokines: 
Select and explain. 
A. Mediators of inflammation, B. Does not mediate specific reactions, C. Produced by macrophages, D. Are soluble proteins
B: Does not mediate specific reactions
Answer: B: Does not mediate specific reactions 
Explanation: Cytokines mediate their effects by binding to specific high-affinity receptors on their target cells. Specific cytokines mediate specific reactions.

Other important characteristics of cytokines

Cytokines are soluble proteins produced by a wide variety of hematopoietic and non-hematopoietic cells.
They are short acting.

They are required for

Regulation of growth
Activation of the immune system
Mediation of inflammatory response