Final answer:
Acute-phase proteins that increase during inflammation are produced by the liver, aiding the immune response, and are not antibodies, enzymes, or cytokines; they are ferritin.
Step-by-step explanation:
Acute-phase proteins that increase in concentration in the plasma during inflammation are a type of protein that are part of the body's innate immune response. They are not antibodies, enzymes, or cytokines, but they can be triggered by cytokines. These proteins are synthesized by the liver and enter the bloodstream, where they help in combating infections. They are involved in processes such as opsonization, which marks pathogens for destruction, and they can activate the complement system which includes pathways like the classical, alternate, and lectin pathways. The correct option for the question - Acute-phase proteins that increase in concentration in the plasma during inflammation are ferritin.