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: Pathology
[{'content': "'Ahus reaction' is best explained by which of the following immune reaction? \nSelect and explain. \nA. Localized immune complex, B. Ag-Ab reaction, C. Compliment mediated, D. Ab mediated", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ahus reaction involves the formation of antigen/antibody complexes in the body after the intradermal injection of an antigen. It is a type III or immune complex mediated hypersensitivity reaction. Type III hypersensitivity involves antigen-antibody complexes which may precipitate around blood vessels and cell membranes causing damage.Ref: Pathologic Basis Of Disease, Robbins, 6th Edition, Page 201; Chandrasoma Taylor 3rd Edition, Page 112; Textbook of Microbiology, Ananthanarayan and Paniker, 7th Edition, Chapter 18, Page 165.', 'role': 'assistant'}]