What is the largest part of the human brain?

The largest part of the human brain is the cerebrum, which makes up about two-thirds of the total brain mass. The cerebrum is responsible for higher brain functions such as consciousness, thought, emotion, and voluntary movement.

It is divided into two hemispheres, left and right, which are connected by a bundle of nerve fibres called the corpus callosum.

Hence, the correct answer is the cerebrum.