Answer:
The correct option is: b. ghrelin
Step-by-step explanation:
Ghrelin is a hormone produced by the ghrelinergic cells of the gastrointestinal tract. This hormone is produced and secreted mostly by the stomach and is responsible for stimulating hunger or appetite. Therefore, the ghrelin hormone is known as the hunger hormone.
This hormone is released when the stomach in empty. The secretion of this hormone stops when the stomach gets stretched.