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': 'Size of liver metastasis that can be detected by CECT is? \nSelect and explain. \nA. I mm, B. 5 mm, C. 1 cm, D. 2 cm', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 5 mmCECT can detect lesions of size upto 5mm but it is difficult to differentiate benign from malignant.", 'role': 'assistant'}]