The correct option is B midbrain
Aqueduct of sylvius, also known as Iter, is found in the midbrain and it serves to connect the IIIrd ventricle with the IVth ventricle.
In the cerebral cortex, sensory areas, motor areas and association areas are found.
In the pons, apneustic area and pneumotaxic centres are found.
Cerebellum contains the most complex neurons of the brain known as Purkinje cells.