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
[{'content': 'Type I hypersensitivity, the mediator is -( \nSelect and explain. \nA. IgE, B. IgD, C. IgM, D. IgC', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., IgE", 'role': 'assistant'}]