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': 'A 10-degree decrease in temperature causes decreases in cerebral metabolic rate by : \nSelect and explain. \nA. 10%, B. 30%, C. 50%, D. 70%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. 70%With each degree fall in temperature, the metabolic rate is reduced by 70%.So by reducing temperature by 10-degree celsius, the metabolic rate is reduced by 70%.Cerebra coex is protected for 10 mins at 30-degree celsius and for 1 hr at 15-degree celsius.', 'role': 'assistant'}]