Which of the following is an effect of complement activation?

• A. Production of antibodies
• B. Activation of B cells
• C. Opsonization of pathogens
• D. Inhibition of phagocytosis

Answer: (C)

Verified step by step guidance

1. Understand that the complement system is a part of the innate immune response, consisting of proteins that enhance the ability of antibodies and phagocytic cells to clear microbes and damaged cells.
2. Recall the main effects of complement activation, which include opsonization, chemotaxis, cell lysis, and inflammation.
3. Recognize that opsonization refers to the process where complement proteins coat the surface of pathogens, making them more easily recognized and engulfed by phagocytes.
4. Note that production of antibodies and activation of B cells are functions primarily associated with the adaptive immune system, not directly caused by complement activation.
5. Understand that complement activation promotes phagocytosis rather than inhibiting it, so inhibition of phagocytosis is not an effect of complement activation.