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': 'The\tprimary\texcretory\torgan\tfor\tthe\tlocal\nanaesthetic and its metabolites is: \nSelect and explain. \nA. Lungs, B. Kidneys, C. Rectum, D. Skin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]