This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skin, Subject name: Medicine
[{'content': "What diagnosis is suggested by the finding on the sole of this patient's foot? \nSelect and explain. \nA. Chemical burn, B. Pemphigus, C. Thrombotic vasculopathy, D. Radiation dermatitis", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer C. Thrombotic vasculopathyThe purpuric skin eruption has a netlike arrangement referred to as retiform. Retiform purpura is an indication of an acute thrombotic vasculopathy. If it is acute and rapidly progressive in a febrile patient, it suggests purpura fulminans.', 'role': 'assistant'}]