Final answer:
Somatostatin is not true to stimulate the secretion of insulin.
Step-by-step explanation:
The statement that is not true of the hormone somatostatin is c. It stimulates the secretion of insulin. Somatostatin is actually an inhibitory hormone that inhibits the secretion of both glucagon and insulin. It is produced by the delta cells of the pancreas and plays a role in regulating blood glucose levels.