Explanation:

- Let’s break it down:

- Spleen: Think of this as your body’s blood filter, not a hormone factory. It doesn’t make insulin.

- Liver: Super important for metabolism, but it doesn’t produce insulin. It stores and releases glucose as needed.

- ?? Pancreas: Here’s your winner. The pancreas makes insulin—and it plays a huge role in regulating your blood sugar.

- Pituitary Gland: The “master gland” is responsible for a bunch of other hormones but not insulin.

- So, your answer (Pancreas) is spot-on. Insulin comes from special cells in the pancreas called beta cells. That’s the gland that does the job.