Circulating Thyroxine Exerts Negative Feedback on

Circulating thyroxine exerts negative feedback on

A) cells of the anterior pituitary, making them less responsive to thyrotropin-releasing hormone (TRH) .
B) cells of the hypothalamus, so they produce and release more thyrotropin-releasing hormone (TRH) .
C) cells of the posterior pituitary, so they produce less thyroid-stimulating hormone (TSH) .
D) cells of the thyroid gland, so they produce less calcitonin.
E) target cells, so they convert less of the inactive to the active form of thyroid hormone.