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: Surgery
[{'content': 'The most sensitive test to detect GI bleeding is - \nSelect and explain. \nA. Selective angiography, B. Radiolabelled, erythrocyte scanning, C. I 131 Fibrinogen studies, D. Stool for occult blood', 'role': 'user'}, {'content': 'Answer: B \nExplanation: • Radionuclide scanning with technetium-99m (99mTc)-labeled RBCs is the most sensitive but least accurate method for localization of GI bleeding', 'role': 'assistant'}]