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': 'A child presented with non a Ranching purpura in the lower limb recurrent abdominal pain further in revealed deposition of IgA. What is the most probable diagnosis - \nSelect and explain. \nA. Henoch schonlein purpura, B. Wegeners granulomatosis, C. Kawasaki disease, D. Takayasu disease', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]