One of the following glands is not an endocrine gland

The answer is: salivary.

One of the following glands is not an endocrine gland, and this gland is the pancreas. The pancreas is made up of both endocrine and exocrine glands, which means it doesn't just produce hormones. The islets of Langerhans located within the pancreas are responsible for producing insulin, which helps regulate sugar levels. Pancreatic juices secreted by the pancreas are essential for the digestion and absorption of nutrients in the body. Thus, while other glands in the body such as those of the thyroid and pituitary are considered endocrine glands, the pancreas is not.