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
Thrombocytopenia occurs in all except: 
Select and explain. 
A. Henoch schonlein purpura, B. TTP, C. DIC, D. Wiskott Aldrich syndrome
A: Henoch schonlein purpura
Answer: A: Henoch schonlein purpura 
Explanation: 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'.