Fact 1: TRH stimulates the pituitary gland to produce thyroid-stimulating hormone, or TSH.

Fact 2: TRH synthesis is regulated directly by thyroid hormones.

Given the two facts above, answer the question "What is TSH regulated by?" with the following options: 
- pituitary
 - sweating
 - animals
 - glucose
 - heat or cold
 - heat produced
 - temperature
 - organ


 

 pituitary        