Final answer:
Opsonization refers to the process in which the Fab portion of an antibody recruits phagocytic cells to destroy pathogens.
Step-by-step explanation:
The correct answer is Opsonization.
Opsonization refers to the process in which the Fab portion of an antibody binds to specific epitopes on the surface of pathogens, marking them for destruction by phagocytic cells such as macrophages, dendritic cells, and neutrophils. These phagocytic cells have receptors on their surfaces that recognize and bind to the Fc portion of the IgG molecules, allowing them to attach to and engulf the pathogens.
Opsonization is crucial for enhancing the efficiency of phagocytosis and promoting rapid clearing of pathogens from the body.