# Which of the following is an opsonin?
A. C3b
B. C3a
C. IgG
D. IgA
The correct answer is A. C3b.
Opsonization is the process of increasing ability for phagocytosis of foreign body. In opsonisation, opsonin antibodies attach to the bacteria and facilitate the phagocytosis of that bacterium.
Different types of opsonins:
• Antibodies- IgM and IgG
• Complement proteins- C3b, C4b
• Circulating proteins- Pentraxins, collectins, and ficolins
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