Given below is a reaction catalysed by enzyme Z.
`overset(X)overset(|)C-overset(Y)overset(|)C overset(Z)rarr X-Y +C=C`
Choose the correct option with respect to the category of enzyme Z.

Options

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

Answer

To determine the category of enzyme Z in the given reaction, we need to analyze the reaction and the roles of different types of enzymes.

### Step-by-Step Solution:

1. **Identify the Reaction**: The reaction provided is:
\[ \overset{X}{\overset{|}C-\overset{Y}{\overset{|}C}} \overset{Z}{\rightarrow} X-Y + C=C \]
This indicates that enzyme Z is catalyzing a reaction where a group (X-Y) is removed from a substrate (C-C) to form a double bond (C=C).

2. **Understand Enzyme Categories**: Enzymes are classified into six main categories:
- **Oxidoreductases**: Catalyze oxidation-reduction reactions.
- **Transferases**: Transfer functional groups from one molecule to another.
- **Hydrolases**: Catalyze hydrolysis reactions, breaking bonds by adding water.
- **Lyases**: Remove groups from substrates to form double bonds or add groups to double bonds.

3. **Analyze the Reaction Type**: In the given reaction, we see that:
- A group (X-Y) is being removed.
- A double bond (C=C) is formed as a result of this removal.

4. **Determine the Enzyme Category**: Since the reaction involves the removal of a group and the formation of a double bond, it fits the definition of a lyase. Lyases are known for their ability to remove groups from substrates without hydrolysis, leading to the formation of double bonds.

5. **Select the Correct Option**: Based on the analysis, the correct category for enzyme Z is:
- **C. Lyase**

### Final Answer:
The correct option with respect to the category of enzyme Z is **C. Lyase**.