This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': 'Tc labeled RBCs are used for all except \nSelect and explain. \nA. LV function, B. GI bleeding, C. Liver adenoma, D. Liver hemangioma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tc-99m labellee rbc is used in assessment of GI bleeding .', 'role': 'assistant'}]