Which type of gland produces a secretion and has a duct?

The type of gland that produces a secretion and has a duct is the exocrine gland. Exocrine glands are characterized by their ability to secrete substances directly into ducts, which then carry these substances to specific sites, such as the digestive system or the skin's surface. Common examples of exocrine glands include sweat glands, salivary glands, and glands in the gastrointestinal tract.

In contrast, endocrine glands secrete hormones directly into the bloodstream without the use of ducts. Apocrine and merocrine glands are specific types of exocrine glands, differentiated by the method of secretion—apocrine glands release a portion of their cell along with their secretion, while merocrine glands release their products via exocytosis without loss of cellular material. However, since both apocrine and merocrine glands are subcategories of exocrine glands, the broader category of exocrine gland is the correct answer in this context.