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': 'Henoch Schoniein purpura is characterized by all except - \nSelect and explain. \nA. Thrombocytopenia, B. Glomerulonerphritis, C. Arthralgia, D. Abdominal pain', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]