Answer:
4. Thyroid hormone levels decrease, TRH level increase, PRL level increase
Explanation:
Surgical removal of Thyroid gland will lead to hypothyroidism.
Normally, the surgery is followed by maintenance dose of thyroxine to avoid side effects.
In the presence of hypothyroidism, however, the decreased thyroid hormone will lead to increase in thyrotropin releasing hormone (TRH). increased TRH increases production of prolactin. (but less than that in prolactinoma)
