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
Human brain is more intelligent than monkey's brain due to 
Select and explain. 
A. Larger brain, B. Increased convulations, C. Increased brain area compared to body surface area, D. More blood supply
A: Larger brain
Answer: A: Larger brain 
Explanation: Association areas, which are related to intelligence and higher functions, are about 85% of the human brain. These are smaller in other animals.