Identify the site of hormone production from the given options.

Hormones are primarily produced by endocrine glands, which do not have ducts and secrete hormones directly into the bloodstream. 

Exocrine glands secrete their products through ducts into a body cavity or onto the body surface. Sweat glands are a type of exocrine gland that secrete sweat onto the surface of the skin to regulate body temperature. Digestive glands are also a type of exocrine gland that secrete enzymes and other substances into the digestive tract to aid in digestion. 

Therefore, in terms of hormone production, the correct option is endocrine glands.