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
Protein-A of S.Aureus binds to Fc region of 
Select and explain. 
A. IgD, B. IgE, C. IgG, D. IgA
C: IgG
Answer: C: IgG 
Explanation: Protein-A binds to Fc region of IgG - basis of coagglutination reaction.