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: Radiology
[{'content': 'Which of the following liver mets appear hypoechoic on USG? \nSelect and explain. \nA. Ca. Colon, B. Ca. Breast, C. Ca. Bladder, D. Mucinous adenocarcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hypoechoic lesions can be secondary to lymphoma, melanoma, breast and lung carcinoma, and less commonly, related to gastrointestinal malignant tumors. Ref: Liver Malignancies: Diagnostic and Interventional Radiology By Carlo Baolozzi, Riccardo Lencioni, 1999, Page 180', 'role': 'assistant'}]