Detailed Solution:
The correct answer is “Insulin”.
Insulin is the hormone secreted by the beta cells of the Islets of Langerhans in the pancreas. It plays a crucial role in regulating blood glucose levels by facilitating the uptake of glucose into the cells.
Glucagon is secreted by alpha cells, while adrenalin (epinephrine) and aldosterone are produced by other glands (the adrenal medulla and adrenal cortex, respectively).