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': "Purpura is a feature of-  a) Disseminated Intravascular Coagulation  b) Henoch Schonlein Purpura  c) Meningococcemia  d) Schamberg's disease \nSelect and explain. \nA. abc, B. abd, C. acd, D. ac", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]