This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
[{'content': 'Lumbar sympathectomy is of value in the management of \nSelect and explain. \nA. Intermittent claudication, B. Distal ischaemia affecting the skin of the toes, C. Aeriovenous Fistula, D. Back pain', 'role': 'user'}, {'content': "Answer: B \nExplanation: . Ans: b (Distal ischemia affecting the skin of toes) (Ref. Textbook of surgery by S. Das-3rd ) - Indications for sympathectomy: 1. Circulatory insufficiency of the limbs (Limb warms, pain reduces and ulcers may show signs of regression) o Atherosclerosis (with rest pain, impending gangrene of toes) o Raynaud's Syndrome (temporary relief) o Buerger's disease 2. Hyperhidrosis 3. Causalgia", 'role': 'assistant'}]