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': 'Type I hypersensitivity includes all of the following except: \nSelect and explain. \nA. Autoimmune hemolytic anemia, B. Anaphylaxis, C. Extrinsic asthma, D. Hay fever', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Autoimmune hemolytic anemia (Ref: Ananthanarayan, 9th/e, p. 162 and 8th/e, p. 162)* Autoimmune hemolytic anemia is type II HSN.* In type II Hypersensitivity reaction (Ab mediated) various mechanisms involves up: (1) Opsonization, complement and Fc receptor mediated phagocytosis (C3b acts as opsonin). (2) Complement and Fc receptor mediated inflammation (C5a acts as chemokine for neutrophil and monocyte. (3) Antibody mediated cellular dysfunction.", 'role': 'assistant'}]