Active thyroid follicles are lined by which type of epithelium?

The thyroid follicle is the structural and functional unit of the thyroid gland. The thyroid gland stores its secretory substances in the lumina of follicles. These cyst-like structures, ranging from 0.2 to 0.9 mm in diameter, are composed of a simple cuboidal epithelium, composed of follicular cells surrounding a central colloid-filled lumen and contacting the colloid as well as parafollicular cells (clear cells; C cells) that are located at the periphery of the follicle and do not contact the colloid.Ref: Textbook of Histology, 4thedition; Chapter 13; Endocrine system; Page no: 355