Set of enzymes that works in low pH is

Options

A. Pepsin and trypsin
B. Salivary amylase and trypsin
C. Pepsin and rennin
D. Lipase and amylase

Answer

To solve the question regarding the set of enzymes that work in low pH, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a set of enzymes that function optimally in low pH (acidic conditions).

2. **Identify the Enzymes**: The options provided are:
- Pepsin and Trypsin
- Salivary Amylase and Trypsin
- Pepsin and Renin
- Lipase and Amylase

3. **Analyze Each Option**:
- **Pepsin**: This enzyme works in acidic conditions, specifically at a pH of about 1.5 to 1.6, which is found in the stomach due to hydrochloric acid (HCl).
- **Trypsin**: This enzyme works optimally at a pH of 7.8 to 8.7, which is not low pH, so it does not fit the criteria.
- **Salivary Amylase**: This enzyme works best at a pH of 4.6 to 5.2, which is slightly acidic but not as low as pepsin.
- **Renin**: This enzyme operates at a pH of about 3.8, which is also acidic and fits the criteria.
- **Lipase**: This enzyme works optimally at a pH of around 8.0, which is not acidic.
- **Amylase**: As mentioned, it works at a pH of 4.6 to 5.2, which is not low enough to be considered a strong acidic enzyme.

4. **Determine the Correct Set**:
- The only enzymes that work efficiently in low pH are **Pepsin** and **Renin**. Both of these enzymes are involved in the process of proteolysis, which is the breakdown of proteins into smaller peptides or amino acids.

5. **Conclusion**: Therefore, the correct answer is **Pepsin and Renin**.

### Final Answer:
The set of enzymes that works in low pH is **Pepsin and Renin**.