This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
The following immunoglobulin DOES NOT fix to complement - 
Select and explain. 
A. IgE, B. IgM, C. IgG3, D. IgG1
A: IgE
Answer: A: IgE 
Explanation: Complement is a complex of nine different fractions, C1 to C9. All classes of immunoglobulin do not fix complement. - only IgM,IgG 3,1 and 2 fix complement. - IgG 4, IgA, IgD or IgE do not fix complement Reference : Anathanarayan & paniker's 9th edition, pg no:120 <\p>