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
Type I hypersensitivity includes all of the following except: 
Select and explain. 
A. Autoimmune hemolytic anemia, B. Anaphylaxis, C. Extrinsic asthma, D. Hay fever
A: Autoimmune hemolytic anemia
Answer: A: Autoimmune hemolytic anemia 
Explanation: 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.