The correct option is D Medulla
The brain is subdivided into telencephalon (also called as cerebrum), diencephalon (thalamus and hypothalamus), cerebellum and brain stem (midbrain, pons and medulla oblongata). The medulla oblongata is the lowest part of the brain stem (the lowest part of the brain). The spinal cord is a cylinder of nervous tissues which originates at medulla at the base of the skull and extends within the vertebral column from medulla oblongata to lumber region. Thus, the correct answer is option B.