The correct option is A Medulla is located on the dorsal side of midbrain
The midbrain is located between the hypothalamus of the forebrain and pons of the hindbrain. A canal called the cerebral aqueduct passess through the midbrain. The dorsal portion of the midbrain consists mainly of four round swellings (lobes) called corpora quadrigemina. Midbrain along with pons and medulla regions of the hindbrain form the brainstem.