The answer is E. Testis.
The other four options are all endocrine glands, which are glands that secrete hormones directly into the bloodstream. The testis is a reproductive organ that produces sperm and testosterone.
The pituitary gland is located at the base of the brain and is often called the “master gland” because it produces hormones that control the function of other endocrine glands. The pancreas is located behind the stomach and produces digestive enzymes and hormones that regulate blood sugar levels. The thalamus is located in the center of the brain and acts as a relay station for sensory information. The adrenal glands are located on top of the kidneys and produce hormones that regulate metabolism, stress response, and blood pressure.