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
Reagenic hypersensitivity is mediated by: 
Select and explain. 
A. IgA, B. IgE, C. IgD, D. IgM
B: IgE
Answer: B: IgE 
Explanation: IgE