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': 'Which Immunoglobulin is involved in anaphylaxis: March 2007 & September 2011 March 2013 \nSelect and explain. \nA. IgA, B. IgE, C. IgG, D. IgM', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: IgE', 'role': 'assistant'}]