From which of the following, pepsin is secreted

Options

A. Lungs
B. Stomach
C. Salivary gland
D. Sebaceous gland

Answer

### Step-by-Step Solution

1. **Understanding Pepsin**: Pepsin is an enzyme that plays a crucial role in the digestion of proteins. It is the active form of pepsinogen, which is its inactive precursor.

2. **Source of Pepsin**: Pepsin is secreted in the stomach. The stomach contains specialized cells that produce pepsinogen.

3. **Activation of Pepsinogen**: Pepsinogen is converted into its active form, pepsin, in the presence of hydrochloric acid (HCl), which is also secreted by the stomach lining.

4. **Identifying the Correct Option**: Given the options (lungs, stomach, salivary gland, sebaceous gland), the only correct answer is the stomach, as it is the organ responsible for the secretion of pepsin.

5. **Conclusion**: Therefore, the correct answer to the question "From which of the following, pepsin is secreted?" is the stomach.