system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Opsonin among the following?
assistant
The correct answer is  Opsonization and phagocytosis: C3b and its cleavage product iC3b (inactive C3b), when fixed to a microbialcell wall, act as opsonins and promote phagocytosis by neutrophils and macrophages, which bear cell surface receptors for the complement fragments.Ref: Robbins and Cotran Pathologic Basis of Disease; 9th edition; Chapter 3; Inflammation and Repair; Page no:89