This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Blood Vessels), Subject name: Pathology
[{'content': 'Necrotizing arterioritis with fibrionoid necrosis is - \nSelect and explain. \nA. Immediate hypersensitivity, B. Cell mediated immunity, C. Antigen-antibody complex mediated, D. Cytotoxic cell mediated', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Antigen-antibody complex mediated o The principal morphological manifestation of immune (antigen-antibody) complex injury is necrotizing vasculitis with necrosis of vessel wall and intense neutrophilic infiltration,o The necrotic tissue and deposits of immune complexes, complement and plasma proteins produce a smudgy eosinophilic deposition that obscures the underlying cellular detail, an appearance termed fibrinoid necrosis.", 'role': 'assistant'}]