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': 'Type II hypersensitivity is mediated by - \nSelect and explain. \nA. Complimented mediated, B. Antibody mediated, C. Immune complex mediated, D. Cell mediated', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Antibody mediated \n\n\nType I reactions (immediate hypersensitivity) → Involve immunoglobulin ‘E’(Ig E) mediated\xa0release of Histamin and other mediators from mast cells and basophils.\nType II reactions (Antibody mediated) → Involve immunoglobulin Gor Immunoglobulin\xa0Mbound to cell surfac antigen, with subsequent complement fixation.\nType III reactions (Immune complex mediated) → involve circulating antigen-antibody\xa0complexes that deposit ii postcapillary venules, with subsequent complement fixation.\nType IV reactions (delayed hvpersensititv. cell mediated) → Mediated by Tcells.', 'role': 'assistant'}]