Which of the following is an endocrine gland?
Pituitary gland
Of the given choices, only the pituitary gland is an endocrine or ductless gland. Sweat and sebaceous glands are present in the layers of skin and carry their secretion to the surface by means of a short duct. Salivary gland is also an exocrine gland as it releases its secretion, saliva, into the mouth by means of ducts.