Which of the following is different from others :

Options

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

Answer

To determine which option is different from the others, we need to analyze the provided options: Gastrin, Tylenol, Glucagon, and Secretin.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are Gastrin, Tylenol, Glucagon, and Secretin.

2. **Classify Each Option**:
- **Gastrin**: This is a hormone produced in the stomach that stimulates the secretion of gastric acid (HCl) and promotes the growth of gastric mucosa.
- **Tylenol**: This is a common name for acetaminophen, which is a medication used to relieve pain and reduce fever. It is not a hormone or an enzyme related to digestion.
- **Glucagon**: This is a hormone produced by the pancreas that raises blood glucose levels by promoting the conversion of glycogen to glucose in the liver.
- **Secretin**: This is a hormone produced in the small intestine that stimulates the pancreas to secrete bicarbonate and digestive enzymes.

3. **Compare the Functions**:
- Gastrin, Glucagon, and Secretin are all hormones that play significant roles in the digestive system and metabolism.
- Tylenol, on the other hand, is a medication and does not function as a hormone or directly relate to digestion.

4. **Conclusion**: Since Gastrin, Glucagon, and Secretin are all hormones, while Tylenol is a medication and not a hormone, Tylenol is the odd one out.

5. **Final Answer**: Therefore, the answer is **Tylenol** (option 2).