An endocrinologist explains that certain pituitary hormones are considered tropic because they target endocrine glands rather than acting directly on most body tissues. Which of the following groups best fits this definition?

• A. Follicle-stimulating hormone, luteinizing hormone, thyroid-stimulating hormone, and adrenocorticotropic hormone
• B. Prolactin, growth hormone, thyroid-stimulating hormone, and oxytocin
• C. Antidiuretic hormone, oxytocin, follicle-stimulating hormone, and luteinizing hormone
• D. Growth hormone, prolactin, antidiuretic hormone, and adrenocorticotropic hormone

Answer: (A)