Correct Answer: Islets of Langerhans

Solution : The correct option is Islets of Langerhans.

The Islets of Langerhans are pancreatic cell clusters that include beta cells that produce insulin. These islets regulate blood sugar levels by manufacturing hormones such as insulin and glucagon. Glucagon elevates blood sugar levels whereas insulin lowers them. The balance of these hormones aids in the maintenance of normal blood glucose levels, which is critical for general health.