Insulin is secreted by ____ of pancreas.

Options

A. `alpha-`cells`
B. `del-`cells
C. `beta-`cells
D. none of these

Answer

**Step-by-Step Solution:**

1. **Identify the Organ**: The question asks about the secretion of insulin and specifies the organ involved, which is the pancreas.

2. **Understand the Structure of the Pancreas**: The pancreas contains specialized clusters of cells known as islets of Langerhans. These islets are responsible for producing hormones.

3. **Locate the Specific Cells**: Within the islets of Langerhans, there are different types of cells, including alpha cells and beta cells.

4. **Identify the Function of Beta Cells**: Beta cells are specifically responsible for the secretion of insulin, which plays a crucial role in regulating blood glucose levels.

5. **Connect the Information**: Since the question is about insulin secretion, we conclude that it is the beta cells of the pancreas that secrete insulin.

6. **Final Answer**: Therefore, the correct answer to the question is: "Insulin is secreted by beta cells of the pancreas."

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