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 consists of two cerebral hemispheres. The cerebellum is involved in motor control. The cortex is the outer layer of an organ like the cerebral cortex. The cochlea is part of the inner ear for hearing. The vermis is part of the cerebellum.

Answer:

A. cerebrum