A 24-year-old man undergoes a surgery and during the operation. an organ is excised and sent for histological evaluation. A light microscopic examination reveals the organ encased by thin connective tissue capsule that enters the substance or the lobes to further subdivide the organ into irregular lobular units. Each lobule contains a cluster of follicles filled with colloid. Follicular epithelium consists of low columnar, cuboidal or squamous cells. depending on the level of activity of the follicle. of the following organs docs this tissue most likely belong to?