This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Which of the following has opsonins on its surface: September 2010 
Select and explain. 
A. IgG, B. IgM, C. IgE, D. IgA
A: IgG
Answer: A: IgG 
Explanation: Ans. A: IgG Examples of opsonin molecules include: Antibodies: IgG and IgA Components of the complement system: C3b, C4b, and iC3b Mannose-binding lectin (initiates the formation of C3b) The most impoant are IgG and C3b