Which gland produces insulin?

• A. Thyroid
• B. Adrenal
• C. Pancreas
• D. Pituitary

Answer: (C)

Insulin is made by the pancreas. Within the pancreas, clusters of hormone‑producing cells called the islets of Langerhans include beta cells that release insulin when blood sugar rises. This hormone helps glucose enter liver, muscle, and fat cells and signals the liver to store glucose as glycogen, lowering blood glucose after meals. Other glands have different duties: the thyroid regulates metabolism, the adrenal glands produce stress hormones, and the pituitary coordinates signals to other glands.