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 represents the half life of I123 ? \nSelect and explain. \nA. 3. 2 hours, B. 13.2 hours, C. 8 days, D. 10 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Half life of radioisotope I 123 is 13.2 hours. Half life of I 124 is 4.2 days and that of I 131 is 8days.', 'role': 'assistant'}]