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
Atopy is mediated by - 
Select and explain. 
A. IgE, B. IgD, C. IgM, D. IgA
A: IgE
Answer: A: IgE 
Explanation: Atopic individuals can have up to 10 times the normal level of IgE in their blood. Atopy is also called IgE mediated reactions Reff: Ananthanarayan &Parkerss textbook of microbiology 9th edition pg:98