**Core Concept**
Amylin is a peptide hormone that plays a crucial role in glucose homeostasis. It is co-secreted with insulin from the pancreas, helping to decrease glucagon secretion, slow gastric emptying, and reduce appetite.

**Why the Correct Answer is Right**
Beta cells in the islets of Langerhans of the pancreas are responsible for producing and secreting insulin and amylin in response to elevated blood glucose levels. Amylin's secretion is tightly coupled with insulin release through the same stimulus, such as elevated glucose or amino acids. This dual-secretion mechanism helps to regulate blood glucose levels by reducing glucagon secretion and slowing gastric emptying.

**Why Each Wrong Option is Incorrect**
**Option A:** Alpha cells primarily secrete glucagon, which raises blood glucose levels, and are not involved in amylin secretion.
**Option C:** Gamma cells are another term for pancreatic polypeptide (PP) cells, which secrete PP to regulate pancreatic exocrine secretion.
**Option D:** Delta cells secrete somatostatin, a hormone that inhibits the secretion of other hormones, including insulin and glucagon.

**Clinical Pearl / High-Yield Fact**
Amylin's effects on slowing gastric emptying and reducing appetite make it a potential therapeutic target for the treatment of diabetes mellitus and obesity.

✓ Correct Answer: B. Beta cells