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
A 10 degree decrease in temperature causes decrease in cerebral metabolic rate by 
Select and explain. 
A. 10%, B. 30%, C. 50%, D. 70%
D: 70%
Answer: D: 70% 
Explanation: Metabolism reduces by 6.7% for every 10C fall in temperature.