(b) Insulin and glucagon

Explanation:

The source of somatostatin is same as that of insulin and glucagons. All these hormones are secreted from endocrine part (called Islets of Langerhans) of pancreas. These endocrine parts contain different types of endorcrine cells which secretes different hormones.

Endocrine cells      Hormones

 α cell                   Glucagon

β cell                   Insulin

γ cell                Gastrin

δ cell             Somatostatin

F cell            Pancreatic polypeptides

Thyroxine and calcitonin are secreted by thyroid gland. Somatotropin and prolactin are secreted from anterior pituitary gland.

Vasopressin and oxytocin are secreted from posterior pituitary gland.