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 commonest IgG with maximum individual variation is - 
Select and explain. 
A. IgG 1, B. IgG 2, C. IgG 3, D. IgG 4
A: IgG 1
Answer: A: IgG 1 
Explanation: IgG1 usually express maximum variations Reff: www.mayoclinic.com