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': 'Oxygen consumption of whole human brain in ml per minute is about \nSelect and explain. \nA. 25, B. 35, C. 45, D. 55', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cerebral o2 consumption is 3.3 ml per hundred gram per minute or 45 ml per minute i.e 20%of the whole body at rest Ref: page no 369 Textbook of physiology Volume 1 AK Jain 7th edition', 'role': 'assistant'}]