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
Which immunogloblin is least impoant in human being - 
Select and explain. 
A. IgE, B. IgD, C. IgG, D. IgA
B: IgD
Answer: B: IgD 
Explanation: Ans. is 'b' i.e., lgD