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
In which of the following palpable purpura is not seen? 
Select and explain. 
A. HSP, B. Scurvy, C. Mixed cryoglobulinema, D. ITP
D: ITP
Answer: D: ITP 
Explanation: ITP causes non palpable purpura. Palpable purpura is the hallmark lesion of leukocytoclastic vasculitis (small vessel vasculitis) Causes of palpable purpura: Vasculitis Cutaneous small vessel vasculitis PAN Emboli Acute meningococcemia Disseminated gonococcal infection Rocky mountain spotted fever Ecthyma gangrenosum Causes of non-palpable purpura: Clotting disturbances Vascular fragility Thrombi Emboli Possible immune complex