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
[{'content': 'Atopy is mediated by - \nSelect and explain. \nA. IgE, B. IgD, C. IgM, D. IgA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]