This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology Pa 1 (Immune Response, Antigen-Antibody Reactions, Hypersensitivity, Structure of Immune System, Immunodeficiency Disorders), Subject name: Microbiology
[{'content': 'PK reaction detects \nSelect and explain. \nA. IgG, B. IgA, C. IgE, D. IgM', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The Prausnitz-Kustner test is an immunologic test formerly used by physicians to determine if a patient has an allergic reaction to a specific antigen. IgE is homocytotropic i.e. species specific. Only human IgE can fix to the surface of human cells. This is the basis of Prautnitz- Kustner reaction, which was the original method of detecting atopic antibody. Examples of Type I Hypersensitivity Reaction.', 'role': 'assistant'}]