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': 'Protein-A of S.Aureus binds to Fc region of \nSelect and explain. \nA. IgD, B. IgE, C. IgG, D. IgA', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Protein-A binds to Fc region of IgG - basis of coagglutination reaction.', 'role': 'assistant'}]