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 metastasis appear hypoechoic on Ultrasonography – \nSelect and explain. \nA. Breast cancer, B. Colon cancer, C. Renal cancer, D. Mucinous adenocarcinoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Metastases from Breast Cancer are typically hypo-echoic (Echopoor) on Ultrasonography.\nMetastases from carcinoma colon and renal cell carcinoma are typically hyper-echoic (or echogenic) while metastasis from mucinous adenocarcinoma typically appears 'calcified'.", 'role': 'assistant'}]