Question

the left side of the dropdown controls the right side of the body (dropdown options: cerebrum, cerebellum, spinal cord, with cerebellum highlighted)

Explanation:

In the brain, the cerebrum has a contralateral control mechanism, meaning the left side of the cerebrum controls the right side of the body (and vice versa). The cerebellum is more involved in coordination and balance, and the spinal cord is a pathway for signals but the primary motor control for contralateral body sides comes from the cerebrum.

Answer:

cerebrum