The endocrine component of pancreas consist of islet of Langerhans that create and release important hormones directly into bloodstream. Two of the main pancreatic hormones are insulin , which acts to lower blood sugar and glucagon which acts to raise blood sugar level.
Therefore, the correct answer is option 'C'.

The endocrine part of the pancreas is the Islets of Langerhans.

Islets of Langerhans:
- The Islets of Langerhans are small clusters of cells located throughout the pancreas.
- They make up about 1-2% of the total mass of the pancreas.
- These clusters contain different types of endocrine cells that produce and secrete hormones directly into the bloodstream.
- The three main types of cells found in the Islets of Langerhans are alpha cells, beta cells, and delta cells.

Alpha Cells:
- Alpha cells make up about 20% of the cells in the Islets of Langerhans.
- These cells produce and secrete the hormone glucagon.
- Glucagon helps to increase blood sugar levels by stimulating the liver to break down glycogen into glucose, which is then released into the bloodstream.

Beta Cells:
- Beta cells make up about 70-80% of the cells in the Islets of Langerhans.
- These cells produce and secrete the hormone insulin.
- Insulin helps to lower blood sugar levels by promoting the uptake and storage of glucose in cells, particularly in the liver, muscle, and fat tissue.
- It also inhibits the breakdown of glycogen and the production of glucose by the liver.

Delta Cells:
- Delta cells make up about 5-10% of the cells in the Islets of Langerhans.
- These cells produce and secrete the hormone somatostatin.
- Somatostatin acts as a regulator of other hormones, inhibiting the release of insulin and glucagon.
- It also slows down the rate of nutrient absorption from the intestines.

Other Endocrine Cells:
- In addition to the alpha, beta, and delta cells, there are other types of endocrine cells present in the Islets of Langerhans.
- These include PP cells (producing pancreatic polypeptide), epsilon cells (producing ghrelin), and gamma cells (producing pancreatic polypeptide).

Function of the Islets of Langerhans:
- The hormones produced by the cells in the Islets of Langerhans play a crucial role in regulating blood sugar levels and metabolism.
- They work together to maintain a stable blood glucose concentration, preventing it from becoming too high (hyperglycemia) or too low (hypoglycemia).
- The balance between insulin and glucagon is particularly important in this regulation.
- Insulin promotes the uptake and storage of glucose, whereas glucagon stimulates the release of glucose from glycogen stores.
- The other hormones produced by the Islets of Langerhans also contribute to the regulation of glucose metabolism and digestion.

Therefore, the correct answer is option 'C' - Islets of Langerhans.