This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'Ganglia spared in lumbar sympathectomy - \nSelect and explain. \nA. L1, B. L2, C. L3, D. L4', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., LI * If unilateral sympathectomy is done, LI L2, L3 and L4 ganglia needs removal for sympathetic denervation of lower limb.* If bilateral sympathectomy is done, on one side LI ganglion is to be preserved otherwise patient will develop impotence.", 'role': 'assistant'}]