Which one is differ from the category of other three

Options

A. Gastrin
B. Glucagon
C. Secretin
D. Ptyalin

Answer

To solve the question "Which one is different from the category of the other three?" we will analyze the given options: gastrin, glucagon, saccharin, and ptyalin.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are gastrin, glucagon, saccharin, and ptyalin.

2. **Classify Each Option**:
- **Gastrin**: This is a hormone secreted by G cells in the stomach. Its primary function is to stimulate the secretion of gastric acid.
- **Glucagon**: This is also a hormone, secreted by the alpha cells of the pancreas. It plays a crucial role in glucose metabolism by raising blood sugar levels.
- **Saccharin**: This is a sweetener, but in the context of hormones, it is often confused with saccharin's role in stimulating insulin secretion. However, it is not a hormone itself.
- **Ptyalin**: This is an enzyme found in saliva that helps in the digestion of starches.

3. **Determine the Commonality**: The first three options (gastrin, glucagon, and saccharin) are related to hormonal functions, while ptyalin is an enzyme.

4. **Identify the Odd One Out**: Since gastrin, glucagon, and saccharin are all hormones (or related to hormonal activity), and ptyalin is an enzyme, ptyalin is the one that differs from the other three.

5. **Conclusion**: The correct answer is ptyalin, as it is the only enzyme among the options, while the others are hormones.

### Final Answer:
**Ptyalin is different from the category of the other three (gastrin, glucagon, saccharin).**