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: Surgery
[{'content': 'One of the following is not indicated for arterial leg ulcer - \nSelect and explain. \nA. Debridement, B. Elevation of limb, C. Head end of bed is raised, D. Low dose aspirin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Because gravity aids the delivery of arterial blood, classically, the patient with rest pain can obtain relief by simply hanging the leg over the side of the bed.\n• Arterial insufficiency ulcers ischemic ulcers are mostly located on the lateral surface of the ankle or the distal digits.\n• Most common on distal ends of limbs.\nEtiology\n• Caused by lack of blood flow to the capillary beds of the lower extremities.\n• Most often endothelial dysfunction is causative factor in diabetic microangiopathy and macroangiopathy\nCharacteristic Features\n• Punched-out appearance\n• Intensely painful\n• Pulses are not palpable\n• Associated skin changes (thin shiny skin, absence of hair, brittle nails)\nDiagnosis\n• The lesion can be easily identified clinically.\n• Arterial doppler and pulse volume recordings for baseline assessment of blood flow.\n• Radiographs may be necessary to rule outosteomyelitis.\nTreatment\n• Vascular surgery to revascularize the area.\n• In infection: Antibiotics + Debridement', 'role': 'assistant'}]