Final answer:
Corticotropin-releasing hormone (CRH) has a tropic effect on the anterior pituitary gland, which in turn releases hormones that regulate other glands, including the adrenal glands.
Step-by-step explanation:
The student has asked which gland Corticotropin-releasing hormone (CRH) has a tropic effect on. CRH is responsible for stimulating the anterior pituitary gland to release adrenocorticotropic hormone (ACTH). This hormone, in turn, stimulates the cortex of the adrenal glands to secrete their hormones.
While CRH indirectly affects the adrenal glands through ACTH, its direct tropic effect is on the anterior pituitary gland. The anterior pituitary gland is often referred to as the 'master gland' because it controls the activities and development of other endocrine glands through various tropic hormones it produces.