The correct option is A Medulla oblongata
The hindbrain comprises pons, cerebellum and medulla oblongata.
-Pons interconnect different regions of the brain and has centres like the pneumotaxic centre which control respiration.
-Cerebellum has very convoluted surface in order to provide the additional space for many more neurons.
-The medulla contains centres which control respiration, cardiovascular reflexes and gastric secretions.