This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autoimmune skin disorders, Subject name: Dental
[{'content': 'Palpable purpura is caused by \nSelect and explain. \nA. HSP, B. PAN, C. Microscopic polyangitis, D. All of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: palpable purpura is due to deposition of immune complexes at the site, seen in HSP,Ahritis, gut vasculitis,glomerulonephritis, bacterial endocarditis, gonococcaemia,meningococcaemia and rocky mountain spotted fever. Page no.309. Reference IADVL's concise textbook of dermatology", 'role': 'assistant'}]