This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology and Rheumatology, Subject name: Medicine
[{'content': 'What is the diagnosis in this patient who had abdominal pain? \nSelect and explain. \nA. Familial Mediterranean fever, B. Henoch-Schonlein purpura, C. Meningococcemia, D. Polyarteritis nodosa', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer B. Henoch-Schonlein purpuraSkin biopsies revealed leukocytoclastic vasculitis with IgA deposition, which is consistent with IgA vasculitis (Henoch-Schonlein purpura). The patient was treated with high-dose glucocorticoids including pulse therapy, which were tapered successfully after cyclosporine was added to the treatment. Henoch-Schonlein purpura, a systemic small-vessel vasculitis, causes palpable purpura in the lower extremities, abdominal pain, arthralgia, and glomerulonephritis.', 'role': 'assistant'}]