Final answer:
Ghrelin stimulates appetite, while obestatin suppresses appetite. Hence the correct answer is option C
Step-by-step explanation:
The secretion of ghrelin stimulates appetite, and the secretion of obestatin suppresses appetite.
Ghrelin, known as the 'hunger hormone', is produced in the stomach and stimulates the sensation of hunger, while obestatin, produced in the same region, has the opposite effect and suppresses appetite. These hormones work in opposition to regulate the feeling of hunger and fullness.
Hence the correct answer is option C