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: Physiology
[{'content': 'Brain blood supply \nSelect and explain. \nA. 55 ml/100 gm/min, B. 400 ml/100gm/min, C. 100 ml/100gm/min, D. 200 ml/100gm/min', 'role': 'user'}, {'content': 'Answer: A \nExplanation: -\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Brain blood supply - 750ml/min OR 55ml/100gm/min OR 13.9% of cardiac output', 'role': 'assistant'}]