Mark the right statement among the following:

Options

A. Trypsinogen is an inactive enzyme
B. Trypsinogen is secreted by intestinal mucosa
C. Enterokinase is secreted by pancreas
D. Bile contains trypsin

Answer

To solve the question, we need to analyze the statements provided and identify the correct one regarding trypsinogen and enterokinase.

### Step-by-Step Solution:

1. **Understanding Trypsinogen**:
- Trypsinogen is an inactive precursor (zymogen) of the enzyme trypsin. It is produced by the pancreas and is secreted into the small intestine where it is activated.

**Hint**: Remember that zymogens are inactive forms of enzymes that require activation.

2. **Activation of Trypsinogen**:
- Trypsinogen is converted into its active form, trypsin, by the enzyme enterokinase. Enterokinase is produced by the intestinal mucosa (the lining of the intestine).

**Hint**: Focus on where enterokinase is produced and its role in activating trypsinogen.

3. **Analyzing the Statements**:
- **Option A**: "Trypsinogen is an inactive enzyme." - This statement is correct as trypsinogen is indeed inactive until converted to trypsin.
- **Option B**: "Trypsinogen turns into trypsin through enterokinase." - This statement is also correct, as enterokinase activates trypsinogen.
- **Option C**: "Enterokinase is secreted by pancreas." - This statement is incorrect; enterokinase is secreted by the intestinal mucosa, not the pancreas.
- **Option D**: "Bile contains trypsin." - This statement is incorrect; bile does not contain any digestive enzymes, including trypsin.

4. **Conclusion**:
- The correct statement among the options is **Option A**: "Trypsinogen is an inactive enzyme."

### Final Answer:
The right statement is **Option A**: "Trypsinogen is an inactive enzyme."