What is the primary role of the hormone thyrotropin-releasing hormone (TRH) in the hypothalamic-pituitary-thyroid axis?

A Stimulation of thyroid hormone production ✓
B Inhibition of thyroid-stimulating hormone (TSH) secretion
C Regulation of adrenal cortisol production
D Stimulation of growth hormone release

Explanation

TRH stimulates the release of TSH from the anterior pituitary, which in turn stimulates the thyroid gland to produce thyroid hormones.

Source

Guyton and Hall Textbook of Medical Physiology
Hormones and Endocrine Markers Endocrinology Hypothalamic-Pituitary-Thyroid Axis Medium MEDICAL Confidence: high