Platelet count is decreased in all of the following condition except:
Answer is A (H. S. Purpura) The mechanism of ecchymosis or purpura in Henoch Schonlein is vasculitis. There is no thrombocytopenia. All other options are known causes of thrombocytopenia.
H. S. Purpura
Idiopathic thrombocytopenic purpura
Thrombotic thrombocytopenic purpura
Systemic lupus erythematosus