The right answer is C. macrophages.
A macrophage is one type of cells of the immune system. It is part of the white blood cells.
Macrophages have three main functions:
* phagocytosis (ingestion of bacteria, yeasts, cellular debris ...). The intracellular vesicle formed is called the phagosome, which will be directed to the lysosome for its complete degradation;
* secretion activity (cytokines ...);
* cellular cooperation (it is an antigen presenting cell, relationship with the lymphocytes).
They are therefore actors of innate immune response, since they phagocytose nonspecific elements. They are attracted to the place of inflammation by chemotaxis.