Read the following paragraph and answer the question. Give ONLY the answer, no other words or explanation.

For example:

Answer: <most likely answer, as short as possible>.

Paragraph: 
The cerebrum is divided into a right and left half ( Figure above ). Each half of the cerebrum is called a hemisphere. The two hemispheres are connected by a thick bundle of axons called the corpus callosum . It lies deep inside the brain and carries messages back and forth between the two hemispheres.


Question: What is each half of the cerebrum called?
a hemisphere
Hemisphere.