Which one of the following paise is incorrectly matched ?

Options

A. Glucagon - Beta cells (source)
B. Somatostain - Delta cells (source)
C. Corpus luteum - Relaxin (secretion)
D. Insulin - Diabetes mellitus (disease)

Answer

To solve the question of which pair is incorrectly matched, we will analyze each pair one by one:

1. **Glucagon with Beta Cell Source**:
- Glucagon is a hormone produced by the alpha cells of the pancreas, not the beta cells. The beta cells are responsible for producing insulin. Therefore, this pair is incorrectly matched.

2. **Somatostatin with Delta Cell**:
- Somatostatin is indeed produced by the delta cells of the pancreas. This pair is correctly matched.

3. **Corpus Luteum with Relaxin**:
- The corpus luteum is a structure that forms in the ovary after ovulation and produces hormones such as progesterone and relaxin. This pair is correctly matched.

4. **Insulin with Diabetes Mellitus**:
- Insulin is a hormone that regulates glucose levels in the blood. A deficiency in insulin leads to diabetes mellitus, which is characterized by high blood sugar levels. This pair is correctly matched.

Based on the analysis, the pair that is incorrectly matched is **Glucagon with Beta Cell Source**.

### Final Answer:
The incorrectly matched pair is: **Glucagon with Beta Cell Source**.