Explanation:

- Pancreas:

- The correct answer is the pancreas. It secretes insulin, which helps regulate blood sugar levels in the body.

- Thyroid:

- The thyroid gland produces hormones that regulate metabolism, but it does not produce insulin.

- Adrenal Gland:

- The adrenal glands produce hormones like adrenaline and cortisol. They do not secrete insulin.

- Pineal Gland:

- The pineal gland is involved in regulating sleep-wake cycles by producing melatonin, not insulin.