Which endocrine hormone stimulates the thyroid gland to secrete thyroxine?

The endocrine hormone that stimulates the thyroid gland to secrete thyroxine is [A] TSH, or Thyroid Stimulating Hormone. TSH is produced by the anterior pituitary gland in response to signals from the hypothalamus. When thyroid hormone levels in the blood decrease, the hypothalamus releases thyrotropin-releasing hormone (TRH), which prompts the anterior pituitary to secrete TSH.
TSH then binds to receptors on cells in the thyroid gland, stimulating the synthesis and secretion of thyroxine (T4) and triiodothyronine (T3), collectively known as thyroid hormones.
Thyroxine plays a crucial role in regulating metabolism, growth, and development throughout the body.
In contrast, the other hormones listed—FSH (Follicle Stimulating Hormone), LTH (Lactogenic Hormone, also known as Prolactin), and ACTH (Adrenocorticotropic Hormone)—have different functions. FSH regulates reproductive processes, LTH stimulates milk production in the mammary glands, and ACTH stimulates the adrenal glands to produce cortisol. Thus, TSH specifically targets the thyroid gland to regulate thyroxine secretion.