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': 'Commonest site of metastasis of Wilm’s tumour is \nSelect and explain. \nA. Bones, B. Lungs, C. Liver, D. Brain', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lungs is MC site for mets in wilms tumor.', 'role': 'assistant'}]