Question

largest mass of the forebrain, consisting of two cerebral hemispheres
cerebrum
cerebellum
cortex
cochlea
vermis

Explanation:

The cerebrum is the largest part of the fore - brain and is composed of two cerebral hemispheres. The cerebellum is involved in motor control, the cortex is the outer layer of the cerebrum, the cochlea is part of the inner ear for hearing, and the vermis is part of the cerebellum.

Answer:

A. cerebrum