The correct answer is: D. They are all peptides.
Mediators of inflammation released by certain type of cell have a function to control the later accumulation and activation of other cells. Chemical mediators of inflammatory responses are soluble, diffusible molecules that can act locally (at the site of tissue damage / infection) or at distant sites. These mediators include vasoactive amines and peptides, eicosanoids, proinflammatory cytokines. They respond to inflammatory process by preventing further tissue damage and ultimately resulting in restoration of tissue function.
