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': 'Thrombocytopenia occurs in all except: \nSelect and explain. \nA. Henoch schonlein purpura, B. TTP, C. DIC, D. Wiskott Aldrich syndrome', 'role': 'user'}, {'content': "Answer: A \nExplanation: Answer is A (Henoch Schonlein I'urpura) The mechanism of ecchymosis or purpura in Henoch Schonlein is vasculitis. There is no thrombocytopenia. All other options are known causes of thrombocytopenia. For details on Henoch Shonlein purpura refer the chapter on 'Connective tissue and metabolism'.", 'role': 'assistant'}]