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: Pathology
Half life of IgG is 
Select and explain. 
A. 1-5 days, B. 2-8 days, C. 6 days, D. 20-23 days
D: 20-23 days
Answer: D: 20-23 days 
Explanation: Half-life of different immunoglobulins –
IgG - About 22 to 25 days
IgA - About 6 to 8 days
IgM - About 5 days
IgE - About 2 to 8 days
IgD - About 3 days