The chemical nature of hormones secreted by \[{\mathbf{\alpha }}\;\] and \[{\mathbf{\delta }}\;{\mathbf{cells}}\] of pancreas is
A. Glycolipid
B. Glycoprotein
C. Steroid
D. Polypeptide

Hint:-Hormones produced by glucagon(which is made of 29 amino acids) and by is somatostatin (which is made of 28 amino acids )of the pancreas are polypeptides.

Complete step-by-step solution:-The pancreas that belongs to both the exocrine and the endocrine systems of vertebrates.it is a glandular organ It is also called mixed gland (endocrine gland and exocrine gland) .As an endocrine gland it secreted several important hormones like insulin, glucagon, somatostatin, and pancreatic polypeptide.
And as an exocrine gland it secretes pancreatic juice that contains digestive enzymes to assist with digestion and the absorption of nutrients in the small intestine. These chemical enzymes help to further break down the carbohydrates, proteins, and lipids in the chime

Islets of Langerhans 
\[\alpha \;cells\] -glucagon
\[\beta \;cells\] -insulin
\[\delta cell - \]somatostatin
\[f{\text{ }}cell\] -pancreatic polypeptide

here alpha cells secrete glucagon which is made of 29 amino acids and the delta cells secrete the somatostatin which is made of 28 amino acids. These 28 amino acids are made of Two forms of somatostatin and 14 amino acids .
So The chemical nature of hormones secreted by \[{\mathbf{\alpha }}\;\] and \[{\mathbf{\delta }}\;{\mathbf{cells}}\] of pancreas is polypeptide
\[\;\therefore \] option D is correct

Note:- there hormones of pancreas
Glucagon hormone- The secretion is stimulated by the ingestion of deficiency of low glucose level leads to hypoglycemia, and by exercise. It is inhibited by the ingestion of carbohydrates. While insulin regulates carbohydrate metabolism ,it is a polypeptide hormone. Deficiency of insulin leads to diabetes.