You are presented with the quiz "What is caused by less production of thyroid-stimulating hormone?" 

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 "low TSH levels occur in hyperthyroidism". 

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


 

       hyperthyroidism    