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: Medicine
[{'content': 'The most common leukocytoclastic vasculitis affecting children is - \nSelect and explain. \nA. Takayasu disease, B. Mucocutaneous lymph node syndrome (Kawasaki disease), C. Henoch Schonelin purpura, D. Polyarteritis nodosa', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]