Digestive enzymes are :

Options

A. Hydrolases
B. Oxidoreductases
C. Transferases
D. Lyases

Explanation

To determine the correct answer to the question "Digestive enzymes are:", we can analyze the options given:

1. **Understanding the Options**:
- **A. Hydrolases**: These enzymes catalyze the hydrolysis of chemical bonds, which involves the addition of water to break down complex molecules into simpler ones. This is a key function in digestion.
- **B. Oxidoreductases**: These enzymes are involved in oxidation-reduction reactions, where electrons are transferred between molecules. They are not primarily involved in digestion.
- **C. Transferases**: These enzymes transfer functional groups from one molecule to another. While they play a role in various metabolic processes, they are not the main enzymes involved in digestion.
- **D. Lysases**: These enzymes break chemical bonds by means other than hydrolysis, often forming a double bond or a ring structure. They are not primarily involved in the digestive process.

2. **Analyzing the Role of Digestive Enzymes**:
- Digestive enzymes are crucial for breaking down food into smaller, absorbable components. This process primarily involves hydrolysis, where water is used to break down complex molecules like proteins, fats, and carbohydrates.

3. **Identifying the Correct Answer**:
- Since digestive enzymes primarily function through hydrolysis, the correct answer is **A. Hydrolases**. This aligns with the definition of digestive enzymes, which facilitate the breakdown of food in the presence of water.

### Final Answer:
**Digestive enzymes are: A. Hydrolases.**