Answer:
Cerebrum
Step-by-step explanation:
Cerebrum is the largest part of the brain where important decisions are made. It is considered as the seat of intelligence. It's outer part is cortex or gray matter which is grayish in color. It contains 2 hemisphere or halves, I.e left and right hemisphere or halves; left hemisphere regulates the right side of the body and right hemisphere regulates the left side of the body.
Hope this helps.