Statement A is correct: The thyroid gland secretes a protein hormone called thyrocalcitonin (TCT) which regulates the blood calcium levels . Statement B is correct: In males, FSH and androgens regulate spermatogenesis . Statement C is partially correct but less specific than A and B in this context (Exopthalmic goitre is a form of hyperthyroidism, but simple goitre is associated with hypothyroidism) . Statement D is incorrect: Glucocorticoids are secreted by the adrenal cortex, not the adrenal medulla . Statement E is incorrect: The secretion of parathyroid hormone (PTH) is regulated by circulating levels of calcium ions, not sodium ions .