This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': "Lumbar sympathectomy can be recommended in all of the following except NOT RELATED SURGERY \nSelect and explain. \nA. Hyperhydrosis, B. Causalgia, C. Buerger's disease, D. Erectile dysfunction", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Lumbar sympathectomy has been used to treat chronic lower limb ischaemia in the past. Lumbar sympathectomy by open operation has, however, been obsolete for several years and even chemical sympathectomy, its minimally invasive equivalent, can now be regarded as outdated. Chemical sympathectomy requires the injection of small quantities of a sclerosant into the lumbar sympathetic chain under radiographic control', 'role': 'assistant'}]