You are presented with the quiz "What stimulates the pituitary gland in order to maintain structural integrity of the thyroid?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "tRH stimulates the pituitary gland to produce thyroid-stimulating hormone, or TSH" and "another function of TSH is to maintain the structural integrity of the thyroid gland". 

So, what's the best answer to the question?


 

 TRH          