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
[{'content': 'Which of the following has opsonins on its surface: September 2010 \nSelect and explain. \nA. IgG, B. IgM, C. IgE, D. IgA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]