This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
[{'content': 'Acute infectious purpura fulminans is caused by \nSelect and explain. \nA. Neisseria meningitidis and varicella, B. Gonococi, C. E. coli, D. Proteus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Purpura fulminans is an acute, often fatal, thrombotic disorder which manifests as blood spots, bruising and discolouration of the skin resulting from coagulation in small blood vessels within the skin and rapidly leads to skin necrosis and disseminated intravascular coagulation caused by Neisseria meningitidis and varicella Ref Harrison20th edition pg 1078', 'role': 'assistant'}]