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': "A 5 year old child presents with perivascular IgA deposition and neutrophilic collection. There is erythematous rash on the lower limbs and non - blanching purpura. The likely diagnosis in the child is \nSelect and explain. \nA. Henoch - schonlein purpura, B. Wegner's granulomatosis, C. Gaint cell vasculitis, D. Kawasaki is disease", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Henoch schonlein purpura\n\nIt is a\xa0common\xa0vasculitis in children\nThis is a vasculitis with IgA deposits affecting small vesseles like arterioles, capillaries and venules of the skin, gut and glomeruli\xa0and commonly associated with arthralgia.\nClinical features include palpable purpura (due to vasculitis and not reduced platelet count), colicky abdominal pain, arthalgia in multiple Joints and glomerulonephritis.\nIt is caused due to immune complex deposition but complement levels are usually normal.', 'role': 'assistant'}]