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': "Isotope used for liver scan is: \nSelect and explain. \nA. Technetium, B. Its', C. Cobalt 60, D. None", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Technetium', 'role': 'assistant'}]