Which brain structure controls unconscious but essential functions such as breathing and circulation

A)  corpus callosum 
B)  pons 
C)  medulla 
D)  cerebellum

Medulla

A part of the brainstem that controls vital body functions such as heart rate, breathing, and blood pressure.

Corpus Callosum

The large band of neural fibers connecting the two hemispheres of the brain, facilitating interhemispheric communication.

Pons

A part of the brainstem that plays a key role in controlling arousal, sleep, breathing, and relaying sensory information between the cerebrum and cerebellum.