Final answer:
CD14 is a surface marker for monocytes and macrophages, which play a key role in the immune response and are heavily involved in the formation of granulomas.
Step-by-step explanation:
CD14 is a surface marker that is typically associated with monocytes and macrophages. Monocytes, which are agranular leukocytes, differentiate into macrophages and dendritic cells. Macrophages are known to be phagocytic cells and play a significant role in the immune response, including the formation of granulomas, which are walled-off areas of chronically inflamed tissue containing microbial pathogens, macrophages, and cellular materials. These structures are almost always present in granulomas because macrophages are key cells involved in chronic inflammation and are turned on by T cell signals to help destroy intracellular bacteria. Therefore, we can assert that CD14 is a marker found on macrophages, which are heavily involved in granuloma formation.