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: Medicine
[{'content': 'The amount of GI bleed that can be detected by angiography - \nSelect and explain. \nA. 0.5 ml/min, B. 0.1 ml/min, C. 5 ml/min, D. 2 ml/min', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]