**Core Concept**
The pancreas has two main parts: the exocrine part and the endocrine part. The exocrine part secretes digestive enzymes into the duodenum, while the endocrine part secretes hormones into the bloodstream. The endocrine part of the pancreas consists of the islets of Langerhans, which contain cells that produce various hormones.

**Why the Correct Answer is Right**
The correct answer is related to the enzymes secreted by the pancreas. The pancreas secretes digestive enzymes such as amylase, lipase, and trypsinogen into the duodenum. However, the endocrine part of the pancreas secretes hormones such as insulin, glucagon, and somatostatin, but not digestive enzymes. The pancreas does not secrete digestive enzymes from the endocrine part, which is responsible for hormone production.

**Why Each Wrong Option is Incorrect**
**Option A:** This option should be filled with the name of an enzyme secreted by the pancreas. However, since the question is about the endocrine part, any enzyme listed here would be incorrect if it's a digestive enzyme.
**Option B:** Similarly, this option should be filled with the name of an enzyme. If it's a digestive enzyme, it would be incorrect for the endocrine part of the pancreas.
**Option C:** This option should be filled with the name of an enzyme. If it's a digestive enzyme, it would be incorrect for the endocrine part of the pancreas.
**Option D:** This option should be filled with the name of an enzyme. If it's a digestive enzyme, it would be incorrect for the endocrine part of the pancreas.

**Clinical Pearl / High-Yield Fact**
The pancreas has a dual function: exocrine and endocrine. The exocrine part secretes digestive enzymes, while the endocrine part secretes hormones. The islets of Langerhans in the pancreas contain cells that produce insulin, glucagon, and somatostatin.

**Correct Answer:** D.